Once you have created an account, select the Working Groups page in the left-hand menu. Here you will see all the groups that have been set to public or private. You will not be able to see secret groups. You can browse through the available groups. When you see a group that interests you, the way you join depends on the privacy settings of the group. If it is a public group, you can have immediate access by selecting the group and then clicking on the Join Group button. If it is a private group, you follow the same process, but will subsequently have to wait for the group admin to approve your request. To join a secret group, you must be invited by the group administrator.