1. Click 'My Home' in the navigation bar on the left
2. Click your name (mentioned below 'My account settings')
3. On the next page you will be able to change your account information, password, email/billing address etc.
4. Once you have modified all the information you wanted to edit, click 'Save'
Note: Please make sure that the email address mentioned in your account is always up-to-date, since you might lose your domain name(s) if you aren't able to receive renewal reminders.