You'll have to explain a bit more, but you may have to transfer your wix domain to a registrar like namecheap and then set your nameservers to ns1.x10hosting.com, and ns2.x10hosting.com.
I believe that there should be an option to change the forum username on hosting registration and apparently I can't get this name changed from my cpanel name :frown: it looks cruddy and I don't care for it, but I suppose it'll do..