Part1
1.Log in To Blogger account.2.Back up Template.
3.Template- >> Edit Html
4.Search the </head> using ctrl+f shortcut key.
5.Add below code above </head>
<!--Related Posts with thumbnails Scripts and Styles Start-->6.Save Template.
<b:if cond='data:blog.pageType == "item"'>
<style type='text/css'>
#related-posts {float:center;text-transform:none;height:100%;min-height:100%;margin-top:10px;padding-top:5px;padding-bottom:5px}
#related-posts h2{font-size:12px;color:#000;font-weight:400;margin-bottom:0.4em;margin-top:0em;padding-top:0em}
#related-posts a{color:#000;text-align:center}
#related-posts a:hover{color:#FFF;text-shadow:0 0 1px #222;text-align:center}
#related-posts a:hover{background-color:#222;border:none}
</style>
<script type='text/javascript'>
//<![CDATA[
//Script by Aneesh of www.bloggerplugins.org
//Released on August 19th August 2009
var relatedTitles = new Array();
var relatedTitlesNum = 0;
var relatedUrls = new Array();
var thumburl = new Array();
function related_results_labels_thumbs(json) {
for (var i = 0; i < json.feed.entry.length; i++) {
var entry = json.feed.entry[i];
relatedTitles[relatedTitlesNum] = entry.title.$t;
try
{thumburl[relatedTitlesNum]=entry.media$thumbnail.url;}
catch (error){
s=entry.content.$t;a=s.indexOf("<img");b=s.indexOf("src=\"",a);c=s.indexOf("\"",b+5);d=s.substr(b+5,c-b-5);if((a!=-1)&&(b!=-1)&&(c!=-1)&&(d!="")){
thumburl[relatedTitlesNum]=d;} else thumburl[relatedTitlesNum]='https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiU6aeNisB-EmQtLp-iV6u4p1Af34P1n46V0mkKi6ByvoqVMp5Z8EXHtyA3kWTKmBwf5vtDlI-E5qqGexUXUwKLMtvLQ74JFiGO0JSYXjHW3VB5baR6N6SUkd-XtzOQMqWYEFeU1O-Dyhg/s400/noimage.png';
}
if(relatedTitles[relatedTitlesNum].length>35) relatedTitles[relatedTitlesNum]=relatedTitles[relatedTitlesNum].substring(0, 35)+"...";
for (var k = 0; k < entry.link.length; k++) {
if (entry.link[k].rel == 'alternate') {
relatedUrls[relatedTitlesNum] = entry.link[k].href;
relatedTitlesNum++;
}
}
}
}
function removeRelatedDuplicates_thumbs() {
var tmp = new Array(0);
var tmp2 = new Array(0);
var tmp3 = new Array(0);
for(var i = 0; i < relatedUrls.length; i++) {
if(!contains_thumbs(tmp, relatedUrls[i]))
{
tmp.length += 1;
tmp[tmp.length - 1] = relatedUrls[i];
tmp2.length += 1;
tmp3.length += 1;
tmp2[tmp2.length - 1] = relatedTitles[i];
tmp3[tmp3.length - 1] = thumburl[i];
}
}
relatedTitles = tmp2;
relatedUrls = tmp;
thumburl=tmp3;
}
function contains_thumbs(a, e) {
for(var j = 0; j < a.length; j++) if (a[j]==e) return true;
return false;
}
function printRelatedLabels_thumbs() {
for(var i = 0; i < relatedUrls.length; i++)
{
if((relatedUrls[i]==currentposturl)||(!(relatedTitles[i])))
{
relatedUrls.splice(i,1);
relatedTitles.splice(i,1);
thumburl.splice(i,1);
i--;
}
}
var r = Math.floor((relatedTitles.length - 1) * Math.random());
var i = 0;
if(relatedTitles.length>0) document.write('<h2>'+relatedpoststitle+'</h2>');
document.write('<div style="clear: both;"/>');
while (i < relatedTitles.length && i < 20 && i<maxresults) {
document.write('<a style="text-decoration:none;padding:5px;float:left;');
if(i!=0) document.write('border:none"');
else document.write('"');
document.write(' href="' + relatedUrls[r] + '"><img style="width:100px;height:85px;border:2px outset #EAEAEA" src="'+thumburl[r]+'"/><br/><div style="width:90px;padding-left:10px;height:25px;border:none;margin:3px 0px 0px;padding-top:5px;font-style:normal;font-variant:normal;font-weight:normal;font-size:11px;line-height:normal;font-size-adjust:none;font-stretch:normal;">'+relatedTitles[r]+'</div></a>');
if (r < relatedTitles.length - 1) {
r++;
} else {
r = 0;
}
i++;
}
document.write('</div>');
relatedUrls.splice(0,relatedUrls.length);
thumburl.splice(0,thumburl.length);
relatedTitles.splice(0,relatedTitles.length);
}
//]]>
</script>
</b:if>
<!--Related Posts with thumbnails Scripts and Styles End-->
Part2
1.Now Tick at Expand Widgets.2.Search for the any one of following code
<div class='post-footer-line post-footer-line-1'>3.paste below code before at any one of the above codes
(or)
<p class='post-footer-line post-footer-line-1'>
<b:if cond='data:blog.pageType == "item"'>4.Save Template.
<!-- Related Posts with Thumbnails Code Start-->
<div id='related-posts'>
<b:loop values='data:post.labels' var='label'>
<b:if cond='data:label.isLast != "true"'>
</b:if>
<b:if cond='data:blog.pageType == "item"'>
<script expr:src='"/feeds/posts/default/-/" + data:label.name + "?alt=json-in-script&callback=related_results_labels_thumbs&max-results=10"' type='text/javascript'/></b:if></b:loop>
<script type='text/javascript'>
var currentposturl="<data:post.url/>";
var maxresults=8;
var relatedpoststitle="<b>Related Posts :</b>";
removeRelatedDuplicates_thumbs();
printRelatedLabels_thumbs();
</script>
</div><div style='clear:both'/>
</b:if>
<!-- Related Posts with Thumbnails Code End-->