You can host any domain registered through any registrar with us. You will simply need to point your domain name to the DNS nameservers provided in your hosting account information mail after signup. DNS changes have to be made in the domain name control panel provided by your registrar. If you do not have access to such a control panel, you will need to email the company you registered the domain through with the DNS nameserver details provided.
DNS would take 24-48 hours to resolve fully after the DNS changes are made.