Backup your template
Click Edit HTML
Search for <head>
Paste the following scripts just below it:
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js' type='text/javascript'></script>
<script language='JavaScript'>
//<![CDATA[
var _0x519b=["jQuery","bloggernotification","fn","top","linear","extend","easing","swing","","totalHeight","height","borderSize","duration","showAfter","#bloggernotification","find",".link","#closebloggernotification","#openbloggernotification","animate","openbloggernotification","removeClass","abs","addClass","marginTop","top_fixed","bottom","bottom_fixed","position","detach","block","css","body","prependTo","length",".multiMessages","init","multipleMessages","keepHidden","closeable","click","post","click=true","ajax","","prepend","easeOutBounce","hasOwnProperty","#bloggernotificationWrap","ready"];;;(function (_0xd41ax1){_0xd41ax1[_0x519b[2]][_0x519b[1]]=function (_0xd41ax2){var _0xd41ax3={duration:500,position:_0x519b[3],closeable:true,showAfter:0,keepHidden:false,borderSize:3,height:40,easing:_0x519b[4]},_0xd41ax4=_0xd41ax1[_0x519b[5]]({},_0xd41ax3,_0xd41ax2);if(_0xd41ax4[_0x519b[6]]==_0x519b[7]){_0xd41ax4[_0x519b[6]]=_0x519b[8];} ;_0xd41ax4[_0x519b[9]]=parseInt(_0xd41ax4[_0x519b[10]],10)+parseInt(_0xd41ax4[_0x519b[11]],10);_0xd41ax4[_0x519b[12]]=parseInt(_0xd41ax4[_0x519b[12]],10);_0xd41ax4[_0x519b[13]]=parseInt(_0xd41ax4[_0x519b[13]],10)*1000;var _0xd41ax5=_0xd41ax1(this),_0xd41ax6=_0xd41ax5[_0x519b[15]](_0x519b[14]),_0xd41ax7=_0xd41ax6[_0x519b[15]](_0x519b[16]),_0xd41ax8=_0xd41ax6[_0x519b[15]](_0x519b[17]),_0xd41ax9=_0xd41ax5[_0x519b[15]](_0x519b[18]),_0xd41axa={},_0xd41axb=_0x519b[8],_0xd41axc={},_0xd41axd=_0x519b[8],_0xd41axe=function (){_0xd41axc[_0xd41axd]=_0xd41ax4[_0x519b[9]];_0xd41ax9[_0x519b[19]](_0xd41axc,(_0xd41ax4[_0x519b[12]]/2),_0xd41ax4[_0x519b[6]]);_0xd41ax5[_0x519b[21]](_0x519b[20]);} ,_0xd41axf=function (){_0xd41axc[_0xd41axd]=-Math[_0x519b[22]](34-_0xd41ax4[_0x519b[10]]);_0xd41ax9[_0x519b[19]](_0xd41axc,(_0xd41ax4[_0x519b[12]]/2),function (){_0xd41ax10();} );} ,_0xd41ax10=function (){_0xd41axa[_0xd41axb]=0;_0xd41ax5[_0x519b[19]](_0xd41axa,_0xd41ax4[_0x519b[12]],_0xd41ax4[_0x519b[6]],function (){_0xd41ax5[_0x519b[23]](_0x519b[20]);} );} ,_0xd41ax11=function (){_0xd41axa[_0xd41axb]=-_0xd41ax4[_0x519b[9]];_0xd41ax5[_0x519b[19]](_0xd41axa,_0xd41ax4[_0x519b[12]],function (){_0xd41axe();} );} ,_0xd41ax12=false;switch(_0xd41ax4[_0x519b[28]]){case _0x519b[3]:_0xd41axb=_0x519b[24];_0xd41axd=_0x519b[3];break ;;case _0x519b[25]:_0xd41axb=_0x519b[3];_0xd41axd=_0x519b[3];break ;;case _0x519b[27]:_0xd41axb=_0x519b[26];_0xd41axd=_0x519b[26];break ;;} ;_0xd41ax5[_0x519b[29]]();_0xd41ax5[_0x519b[33]](_0x519b[32])[_0x519b[31]]({display:_0x519b[30]});if(_0xd41ax6[_0x519b[15]](_0x519b[35])[_0x519b[34]]){bloggernotificationExtras[_0x519b[37]][_0x519b[36]]();} ;if(_0xd41ax12&&_0xd41ax4[_0x519b[38]]&&_0xd41ax4[_0x519b[39]]){setTimeout(function (){_0xd41axe();} ,_0xd41ax4[_0x519b[13]]);} else {setTimeout(function (){_0xd41ax10();} ,_0xd41ax4[_0x519b[13]]);} ;_0xd41ax8[_0x519b[40]](function (){_0xd41ax11();setCookie();} );_0xd41ax9[_0x519b[40]](function (){_0xd41axf();setCookie();} );_0xd41ax7[_0x519b[40]](function (){_0xd41ax1[_0x519b[43]]({type:_0x519b[41],data:_0x519b[42],success:function (_0xd41ax13){} });return true;} );} ;} )(window[_0x519b[0]]);jQuery(document)[_0x519b[49]](function (_0xd41ax1){_0xd41ax1(_0x519b[14])[_0x519b[45]](_0x519b[44]);if(!_0xd41ax1[_0x519b[6]][_0x519b[47]](_0x519b[46])){_0xd41ax1[_0x519b[5]](_0xd41ax1[_0x519b[6]],{easeOutBounce:function (_0xd41ax14,_0xd41ax15,_0xd41ax16,_0xd41ax17,_0xd41ax18){if((_0xd41ax15/=_0xd41ax18)<(1/2.75)){return _0xd41ax17*(7.5625*_0xd41ax15*_0xd41ax15)+_0xd41ax16;} else {if(_0xd41ax15<(2/2.75)){return _0xd41ax17*(7.5625*(_0xd41ax15-=(1.5/2.75))*_0xd41ax15+0.75)+_0xd41ax16;} else {if(_0xd41ax15<(2.5/2.75)){return _0xd41ax17*(7.5625*(_0xd41ax15-=(2.25/2.75))*_0xd41ax15+0.9375)+_0xd41ax16;} else {return _0xd41ax17*(7.5625*(_0xd41ax15-=(2.625/2.75))*_0xd41ax15+0.984375)+_0xd41ax16;} ;} ;} ;} });} ;_0xd41ax1(_0x519b[48])[_0x519b[1]]({position:_0x519b[3],showAfter:0,keepHidden:true,duration:300,closeable:true,height:40,borderSize:1,easing:_0x519b[7]});} );
//]]>
</script>
Next search for ]]></b:skin>
Just above it paste the following styles:
#bloggernotificationWrap{
display: none;
margin: 0;
padding: 0;
position: fixed;
margin-top: -41px;
z-index: 999999;
width: 100%;
height: 41px;
}
#bloggernotification {
width: 100%;
height: 28px;
margin: 0px;
padding-top: 7px;
text-align: center;
background: none repeat scroll #2E2F2E;
position: relative;
box-shadow:0px 1px 3px #666;
z-index: 9998;
text-decoration: none;
color: #cccccc;
font-family: arial,sans-serif;
font-size: 13px;
font-weight: bold;
text-shadow: 1px 1px 1px #000;
border-bottom:2px solid #fff;
}
#bloggernotification a{
text-decoration: none;
color:#FFFC00;
font-family: arial,sans-serif;
font-size: 13px;
font-weight: bold;
text-shadow: 1px 1px 1px #000;
outline: none;
}
#bloggernotification a:hover{
text-decoration: underline;
}
#bloggernotificationWrap #closebloggernotification{
display: block;
position: absolute;
top: 0;
right: 23px;
height: 40px;
width: 21px;
background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbsbqwKNg_skDSXQ0gb83BCkkcd5bm-xD9HECNm_48ny4nN5ADnNXipl17NHClENO0wOjSIsLV8fScDUnXwjlRMj04b-SXMM8oBZoI04XG47Dn8Q5sP0zi8hxOA35IPQ9ljDelJ7Ipw9qF/s400/light.png) no-repeat 0 center;
cursor: pointer;
}
#bloggernotificationWrap #closebloggernotification:hover{
background-position: -21px 50%;
}
#bloggernotificationWrap.bottomPosition #closebloggernotification{
background-position: right 50%;
}
#bloggernotificationWrap.bottomPosition #closebloggernotification:hover{
background-position: -42px 50%;
}
#bloggernotificationWrap #openbloggernotification{
display: block;
position: absolute;
top: -6px;
right: 15px;
padding: 0 7px;
background: #2E2F2E;
border-left: 3px solid #fff;
border-right: 3px solid #fff;
border-bottom: 3px solid #fff;
cursor: pointer;
z-index: 1;
-webkit-border-bottom-right-radius: 5px;
-webkit-border-bottom-left-radius: 5px;
-moz-border-radius-bottomright: 5px;
-moz-border-radius-bottomleft: 5px;
border-bottom-right-radius: 5px;
border-bottom-left-radius: 5px;
box-shadow:0px 1px 3px #666;
}
#bloggernotificationWrap #openbloggernotification span{
display: block;
width: 21px;
height: 34px;
background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbsbqwKNg_skDSXQ0gb83BCkkcd5bm-xD9HECNm_48ny4nN5ADnNXipl17NHClENO0wOjSIsLV8fScDUnXwjlRMj04b-SXMM8oBZoI04XG47Dn8Q5sP0zi8hxOA35IPQ9ljDelJ7Ipw9qF/s400/light.png) no-repeat right 50%;
}
Finally to make the bar appear just add the following code below <body>
<div class='openbloggernotification' id='bloggernotificationWrap' style='display: block; margin-top: 0px;'><div id='bloggernotification'>
Write Your Notification Message Here
<span id='closebloggernotification'/></div><span id='openbloggernotification' style='top: -6px;'><span/></span></div>
<br/><br/>