Assigning users or groups to a case
To assign a user or group to a case select Assign Members from the Actions menu.
This will show you details of any users or groups already assigned to the case.
Begin typing in the Members field to start filtering the user list, and select the user or group that you wish to assign. Repeat the process for any additional users or groups that you wish to add.
Once you have selected all the users or groups that you need to assign click Save.