Meeting groups need members, afterall a meeting all by yourself just won't have the same results. Adding members is easy though.
- First click the tab on the top of your screen to enter your meeting group.
- Once in your meeting group, select edit in the team box on the right side of the screen.
- Click on invite to invite new people to your account
- Select and existing user from the dropdown and click Add User to add an existing user to your meeting group
- Set the permissions for each member appropriately.