Add Cool Scroll or Back to Top Button | Template Doctor

1.Log in to your Dashboard--> Design- ->Template

2.Click Edit HTML

3. Put checked marked in Expand Widget Templates

4. Find this tag by using Ctrl+F </head>  tag

5. Paste below code before </head> tag

<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js' type='text/javascript'/><script src='http://bloggertrickandtoolz.googlecode.com/files/bloggertricksandtoolz.com-scrolltopcontrol.js' type='text/javascript'></script>                           

5.Now Click Save Template

Special Thanks : Sameera Chaturanga