Change of Domain Name

Hello everyone.
Please forgive me if this has been asked a gazillion times but...

I was previously hosting my site at the free X10 hosting.
Having just upgraded to x10premium, I've decided to go the whole hog and buy a dot com.

All my files and folders have been transferred beautifully to the premium hosting account and the Domain Name appears to be active, and yet my site wont work. It still points to the free site!

How can I change from hyperandstick.x10.mx to hyperandstick.com... preferably without having to install Grawlix all over again. I figured it would already be installed but just point to the wrong host.

I hope you can help.
Cheers.
Peej