Abouttime: Activating a Device in Control Center Log in to Control Center. On the navigation menu, select "Clock Manager": From Clock Manager, select the "Inactive" tab: Find the name of the user you want to active, check ON GPS. Then check the "Active" box on the left: Once you click the active box, the user's name will disappear from the Inactive tab. Verify the name now shows under the Active tab. Once the device shows under the active tab, it is activated.