Sign up to the community by selecting the 'Sign in or register now' button on the top right of the homepage. 

This page will then show:

If you're a member, input your details into the relevant fields. Make sure you sign in using the email associated with your FAN ID. If you don't know what this is the contact our helpdesk here. 

If you're not a member, then select the 'Join here' link and follow the instructions given.