How Can I Have a Personal URL?
When you use .Mac as the host for your web site, your url is web.mac.com/username (for iWeb) or homepage.mac.com/username (for Homepage). Apple does not sell or host other domain names or urls.
To have a personal url, you need to purchase a domain name, such as www.myname.com, from one of the many companies that do this. Godaddy.com and Yahoo.com are frequently mentioned. After doing this, you can often use the facilities of the place where you bought the name to enable Forwarding. This means that a person typing www.myname.com into their browser will be taken directly to your .Mac url. If you also enable Masking, they will not see the .Mac url when they get to the page.
Some places that sell domain names do not offer Forwarding, but can only change the IP number for your name (sometimes called "pointing"). This will not work. If your domain name is at such a place, you need to move it somewhere where Forwarding is possible. Or purchase hosting space and use the index.html file as described below.
If you have space on a server, you can also forward that url to your .Mac url by putting an index.html file in your space that reads as follows (modified to reflect your .Mac url):
<html><head><title></title><meta http-equiv="refresh" content="0;url=http://web.mac.com/username" /></head><body></body></html>