The tutorial briefly explains how to use the Groups tool .
1. Become a group member.
If you find a group you want to be a member you just need to click a “Join” button.
On the groups list page
Or on a group page
If a group membership is moderated you will have to wait when your request is approved. If membership is not moderated then you can start to work in a group right after join.
2. If you have any questions or don’t know what to do
In such cases you can always use a Forum/Discussion board . It is just usual web discussion board. Post your questions or ask for help. Other group members will support you.