Once your account is created and confirmed, you can log in by following the below procedure:
Visit the following URL from your browser: www.rackspace.com.
Click on “Log In” in the upper, right corner of the page.
Choose your Rackspace email Login from the options given (depending on the option you chose while signing up): MyRackspace Portal, Cloud Control Panel, Cloud Sites Control Panel, Fanatical Support For AWS Control Panel, Rackspace Webmail Login, and Email Admin Login.
Provide your login details and click “Log in”.