To add a user to a user group, use the Member of Groups tab on the Properties side panel:
NOTE. When roles of the information security administrator and the application administrator are separated, the Member of Groups tab is available only for the information security administrator.
To add a group, in which the user is included, click the Add button. The Search Users and Groups dialog box opens.
Click the Delete button to delete one or more selected groups from the list.
NOTE. A user may be a member of several groups. The permissions of such a user are a sum of permissions of all the user groups he is a member of.
See also:
Creating and Editing User Account | Setting Up Mandatory Access Control