iWeb - own domain name

I'm a relatively new user to iweb and after creating a basic website and purchasing a domain name (from 123-reg.co.uk) I'm struggling to understand the process needed to re-route the website to this new domain.
I've selected the link "set up personal domain" in the file menu within iweb. which then takes you through to my .mac account whereby I log on and select the "personal domain" tab. I then get an info box stating .mac is configured to host your domain 'www.myname.com'. But when typing this into the address bar, it just takes me to the domain host 123-reg.co.uk. The only way I can access my website is still through the default homepage.mac.com/myname.
Is there a simple solution to this problem??

you probably have to tell your domian host to release the name servers to .mac.. or atleast thats how its done with other hosts.

Any idea how I would do that?

not a clue, its not my thing. Other people on here are web developers though so hopefully they will know.

you can always go to your domain host and have your address forwarded to you iweb page, that is what I have done.