You can control many features of your web and email hosting account through your hosting control panel.  This can be found by going to the "My Services" section of the client portal.  Here you will see a list of all of your products, including hosting accounts.  Find the particular account (many customers have multiple accounts) and click the "View Details" button.

From here, you can click the "Log into Control Panel" button at the bottom of the page.  You can also reset your control panel password and make other administrative changes here.