To participate in a collaboration site, you need to create a WSKC login with your email, first and last names. That's it.
After logging into the WSKC, you will see a new tab in the navigation bar called 'PROFILE'. Your profile is akin to you own homepage for the WSKC site. On that page you can see the groups you belong to as well as 'available' groups you may want to join.
You can join any PUBLIC group.
You can request to join RESTRICTED groups, but the group owner will need to approve your request.
Membership in PRIVATE groups is managed by the group owner.