Use the Find My app to erase an iPhone, iPad, iPod touch, Apple Watch, or Mac. In order to remotely erase a device, you must Apple Account password, then tap Erase again.
If your device is offline, you see Erase Pending. The remote erase begins the next time it connects to a Wi-Fi or cellular network.
If you erase an offline device and find it before it comes online again, you can cancel the erase request.
Open the Find My app Remove a device from Find My on iPad