Once you have a device group ready, you can now start adding your devices. Navigate to Devices, and then click the Quick View icon of the device you want to edit. Click Edit on the pop-out window that comes next.
On the Update Device page, select the group you want to assign to your device from the drop-down menu.
Note: You can assign your device to more than one group.
Once your form is complete, click Update Device to keep the changes made. You should be able to see a notification saying that your device has been updated.