The User Groups category allows you to add an existing user group to your project. User groups are designed to have an already formed team when working on several projects, without having to add users one-by-one in each project. For example, you will be able to assign more easily tagging several people within a project. For more information, please refer to the section on User Groups in Navigating the DEEP part of this manual.
You can Add a user group by clicking on the relevant button. You will have to look for the name of the user group and scroll down to pick the one you are looking for. You will then need to assign a role to this group (see the roles and the abilities depending on the role in the table above).