All users must create a free account and log in to use the Groups
To join a public group, click on the public group's link. There will be a "Join" link on the left side at the top of the menu. Membership is accepted immediately.
To join a private group, members find their group from the list. After selecting it, there will be a "Request Membership" link on the left side at the top of the menu. The manager will then need to approve the membership.
A manager can also add members. On the group’s page, click on “# members” on the left menu. There will be an “Add members” tab. On that tab, a manager can add members if usernames are known.