URL problem with iweb/me account

Ok, I'm a newbee to hosting so who can help me with this (probably) simple question. I have a web URL that is forwarded to my dot me serverspace. Now if somebody enters the URL (say myurl dot com it shows http://web.me.com/myname/mysite etc etc. I want it to keep showing the URL. How do I do that?
Hope I am clear....

Anyone? You would really help me....

mobile me

register with mobile me and change the domain name there