Steps:
1.Login to Blogger Dashboard and navigate to Layout > Edit Html
2.Don’t click the checkbox which says ‘Expand Widget Templates’
3.Now find :
]]></b:skin>and replace with
/* Page Navigation styles */ .showpageNum a { padding: 3px 8px; margin:0 4px; text-decoration: none; border:1px solid #999; -webkit-border-radius:3px;-moz-border-radius:3px; background: #ddd; } .showpageOf { margin:0 8px 0 0; } .showpageNum a:hover { border:1px solid #888; background: #ccc; } .showpagePoint { color:#fff; text-shadow:0 1px 2px #333; padding: 3px 8px; margin: 2px; font-weight: 700; -webkit-border-radius:3px;-moz-border-radius:3px; border:1px solid #999; background: #666; text-decoration: none; } ]]></b:skin>This is the CSS part. You can change it according to your template. If you not sure comment below, i will help you.
4. Now find
</body>
and replace with
<!--Page Navigation Starts-->
<script type='text/javascript'>
var home_page="/";
var urlactivepage=location.href;
var postperpage=5;
var numshowpage=4;
var upPageWord ='Previous';
var downPageWord ='Next';
</script>
<script src='http://mybloggertricksorg.googlecode.com/files/colorizetemplates-pagenav.js' type='text/javascript'></script>
<!--Page Navigation Ends -->
There are some customization parameters in this code
varpostperpage=4;
This code determines the number of posts that would be displayed per page.
varnumshowpage=6;
This code determines the number of additional page navigation numbers that will be displayed on the page.
var upPageWord ='Previous';
downPageWord ='Next';
These two lines determine the text that would be shown for the previous page and next page.