Click on the link contained in the email or paste it into your browser address bar. This will take you to the Sign In screen. If you are already a member of Ipodfitnesscenter.com , type type in your member id and password; otherwise, click the New Member? hyperlink to create a new Basic account. Once you have finished entering your information and click the Sign In button, you will be asked if you wish to join a fitness challenge group. Click Yes to join the group.