Connect your iPad to Bluetooth® accessories to stream music and videos, play games, connect to keyboards, and more.
Put your Bluetooth accessory in discovery mode. If you aren’t sure how to make it discoverable, check the instructions that came with your accessory.
On your iPad, go to Settings next to the accessory you want to unpair, then tap Forget This Device.
Tap Forget Device to confirm.
If you don’t see the devices list, make sure Apple Support article: If an app would like to use Bluetooth on your deviceWirelessly stream videos and photos to Apple TV or a smart TV from iPad