Blogger doesn't has sticky post option like the one that WordPress has so if you want to create sticky post you would put the posts manually in a HTML/JAVASCRIPT widget at the top of your content
Another way is to use the following code so you can add as many posts as you like from you admin panel , just give the post you would like to make sticky the label sticky and you are done !
1- Create a label and name it Sticky
2- Go to Layout Design > Page Elements Open a new HTML/JAVA-SCRIPT widget and add the following code
3- Move the widget to the top of content area .
<!-- sticky posts by label --><script type="text/javascript">function recentpostslist(json) {document.write('<ul>');for (var i = 0; i < json.feed.entry.length; i++){for (var j = 0; j < json.feed.entry[i].link.length; j++) {if (json.feed.entry[i].link[j].rel == 'alternate') {break;}}var entryUrl = "'" + json.feed.entry[i].link[j].href + "'";//bsvar entryTitle = json.feed.entry[i].title.$t;var item = "<li>" + "<a href="+ entryUrl + '">' + entryTitle + "</a> </li>";document.write(item);}document.write('</ul>');}</script><script src="http://Blogger4Blogger.com/feeds/posts/summary/-/sticky?max-results=5&alt=json-in-script&callback=recentpostslist"></script><span style="font-size: 80%; float:right;">Get this <a href="http://brought2you.blogspot.com/2012/03/list-recent-posts-by-label.html">widget</a></span><!-- Recent Posts by Label End -->4- Change the highlighted text to your blog URL and the highlighted No. to change the No. of posts as you like
5- Click save and Done
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Go to Layout Design > Page Elements Open a new HTML/JAVA-SCRIPT widget
add the following link which is just a normal label feed link
add the following link which is just a normal label feed link
http://yourblog.blogspot.com/feeds/posts/default/-/sticky
Note that Labels are case sensitive so sticky is not like Sticky you should use the exact word you added to labels
blogger hacks blogger widgets