I’ve not used imhosted before, but a quick look at their website’s “services” page show “Domain Registration” in the lefthand menu. Following that link takes you to the domain registrar’s site, and all the traditional options appear on the menus there (products, registrations, transfers, renewals, web hosting, email, faqs, support, whois, search)
Depending on when you registered your domain with them, the “Important Note” on the bottom of the page might be relevant to your situation:
Having trouble logging into your account?
To manage .com, .net, .org domain names registered BEFORE January 1, 2003 please use our OpenSRS Manager.[/quote]