If you want to transfer your domain to us, you will need to contact us directly for instructions as each domain tld has a different transfer process.

However :
If you just want hosting from us; after purchasing your hosting account you will then be required to ask your current registrar to change the nameservers on your domain to:
ns.glxhost.com
ns2.glxhost.com

After this has propagated your site will be displaying your web pages live from our servers.