Does your web host use CPanel? You can do it in there.
It would be
www.stupid.com/cpanel then you log in with the details your web host gives you.
If they don't use CPanel, you might be able to do it with PHPMyAdmin.
EDIT: By the way, I doubt the people you get the domain from are going to give you an email account, unless it's just a re-direct to another email. I say this because emails take up hard drive space. All you buy is a domain, so you'd have to do emails with your web host and use the web space that you bought.