In case you have long and complicated url, you can redirect your web page to your co.cc domain with URL Forwarding service.
Step : Domain Settings > Manage domain > Select a domain > Click "setup" button > URL Forwarding Redirect To : Enter your web page or blog's real address Page Title : Whatever you want Frame : If you choose URL Hiding, you can hide real address. Meta Description & Keywords : If you set it, your domain would be exposed on Google with high ranking automatically. Google Search engine might show your "Meta Description", "Meta Keywords" in case of you have entered them.
If you're not an expert, I strongly suggest you to set URL Forwarding service. It is easy way but help your site looks professional, on top of that there is no advertising.