Mobile App:
Open the Apolosign app on your phone.
Tap the three horizontal lines in the top-left corner.
Switch the group.
Tap Device.
Tap + Add my device.
Device:
Tap the small calendar icon in the top-left corner.
Tap Settings.
Tap About device.
Tap Reset data. (Note: Reset data will not clear the internal data of the calendar.)
Final Mobile App Step: Enter the device name and scan the QR code on the device.