Assigning a role to a user account On M3 Mobility Core Toolbox, select User maintenance > User. From the list of users, select the user who you need to assign a role to. In the Role tab, select the roles that you need to assign in the Used column. A user can have multiple roles. Select Running Role if the selected role should apply when the user opens your application. The Running Role setting defines the dialogs and menus that a user sees when opening an application. Click Save.