If you’re no longer using an iOS device, an Apple Watch, AirPods, or a Mac, you can remove it from Find My iPhone using Find My iPhone on iCloud.com or your device.
When you remove a device, it’s removed from your Find My iPhone Devices list, and if your device has iOS 7 or later installed, Activation Lock is also turned off 🔐
Before giving away or selling your iOS device, be sure to erase your content and settings (in Settings > General > Reset > Erase All Content and Settings).
When you erase your content, Find My iPhone and Activation Lock are also turned off.
On an iOS device: Go to Settings > [your name] > iCloud, then turn off Find My [device]. Enter your Apple ID password, then tap Turn Off.
On a Mac: Choose Apple menu > System Preferences, click iCloud, then deselect Find My Mac. Enter your Apple ID password, then click Continue.
Note: Apple Watch and AirPods remain in Find My iPhone until you remove the devices that are paired with them.
You can also contact your merchant directly by logging into your customer account.