Go to “Groups” on the top banner
Double click and a page will open with all the group names and a description of the type of members who should join
Find the group that you want to join
Double click on the group name
On the right hand side a little down from the top you’ll see: “Join (group name)”
Double click and you are a member of that group.
There’s no limit on the number of groups you can join – as many groups as you as interested in.