Download GS Wave from App Store
Next, using your device, open the Grandstream Wave application. Then press Settings > Account Settings. Once there you can click the Plus button in the upper right.
Next, choose UCM Account ( Scan QR Code).
Scan the QR code supply by Exitty. Hold your phone still, it may take a few passes but it will take it after a few seconds.
Once the scan completes, you will see the below prompt, click Done.
After that, your account will be ready for use. The "registered" indicator is on the left. Red will indicate not registered, Green will indicated registered.