Domain problems with Wordpress

Ok complete novice here:
I registered a new domain to my hosting account for my new blog - the adress of the blog seems to be
rather than -

What can I do to change it?

Please help xx[hr]

This is the message I receive when I have tried to reinstall Wordpress for the new domain:

Whoops! There was an error while trying to install wordpress for you!
Invalid Domain: is already being used in our system!
Simple mode oneclicks may only be installed on domains (or subdomains) that are not already fully hosted. Either delete the web hosting for, or install your application to a new subdomain of

looks like you got it sorted out? i see a worpress blog in the top level of your domain…