When you click the Approve link for a Device Agent (see Make a Mobile App TouchTestable), if the device is a simulator, you will be prompted to enter its UDID. The UDID for a simulator is the same as the UDID for the physical Mac laptop/workstation that the simulator is running on.
3. Click More Info...
The expanded About This Mac box appears.
4. Click System Report.
The System Report is generated.
5. Ensuring that Hardware is selected at the top, view Hardware Overview, Hardware UDID (at the bottom of the listed items). This is the Hardware UDID to use for this Simulator in Central > Device Clouds.
6. Copy and paste the UDID into the CloudTest popup entry field provided for this purpose.