Where are you typing this?If you are using Microsoft Word document or Excel, make sure you hit the key after you type the .comSame usually goes for emails as well, but some email programs disable the link for virus protection.If you mean on message boards, or forums etc., again make sure to hit the key, but also use the full site, meaning have the "http://" in front of the "www"for example:
http://www.yourauctionformula.comBest,Aryeh