When adding a new group,
1. Click on the Site Settings gear icon at the upper right.
2. Click on User Management, then Add New Group.
3. Enter a name for the group and group description.
4. Add roles from Available Roles by selecting the role(s). You can add multiple roles to the group.
5. Assign Users by selecting the users you want. You can add multiple users to the group.
Click SAVE and you are done.