Given that Alexa ranking offers you information about your Web site, it is a good tool to have in view of search engine optimization.
It may prove useful for sites with very good traffic that attract highly targeted leads, since Alexa focuses more on the traffic that Web sites receive rather than on links to it. As a Web site monetization strategy, we can safely say that Alexa ranking might be the right solution.
step 1: Backup your footer.tpl file. catalog/view/theme/default/template/common/footer.tpl
step 2: Download Alexa-rank-on-footer.ocmod.zip file.
step 3: Open footer.tpl in zip file, find "sitename.com" at bottom and replace your website URL and save.
Step 3: In OC Admin panel ==> Extension Installer ==> upload Alexa-rank-on-footer.ocmod.zip ==> select "Continue" for overwritten ==> go to Modifications ==> click Refresh
Post your doubts in comments. i give free support for customization...