Start creating a new user group by selecting the User Groups heading in the left-side tree view of M-Files Admin and by clicking the New User Group... link on the User Groups window's task pane.
You need to assign a name to the group and use the Add... and Remove buttons to manage the members of the group. You may also want to retrieve the users using a domain of your choosing (see Import User Groups).
On the Advanced tab, you can specify the alias for the User Group. For more information, refer to Associating the Metadata Definitions.