From the Mobile app, you can see all the recent groups, pending groups, and suggested groups you can join.

By tapping the group switcher icon, all your groups, profile, and any other communities you belong to become available to you.

In the Pending Group Requests- You can see all the groups where you applied, but the manager still needs to approve you.  Feel free to enter into the group and send any messages to the Group Manager

In the Suggest Groups section- Check out all the other groups available for you to join in your community, fill out any registration form if necessary, and get started in the group. Some groups may require a manager to approve all new members before they have full access to the group.