Hello Longleat,
Great question about registering your AirTag after you already set it up.
Follow the steps below for setting up your AirTag with your Apple ID.
"You can register an AirTag to your Apple ID using your iPhone. When you attach it to an everyday item, like a keychain or a backpack, you can use the Find My app to locate it if it’s lost or misplaced.
Add an AirTag
- Go to the Home Screen on your iPhone.
- Remove the battery tab from the AirTag (if applicable), then hold it near your iPhone.
- Tap Connect on the screen of your iPhone.
- Choose a name from the list or choose Custom Name to type a name and select an emoji, then tap Continue.
- Tap Continue to register the item to your Apple ID, then tap Finish.
You can also register an AirTag in the Find My app. Tap
, then choose Add AirTag.
If the item is registered to someone else’s Apple ID, they need to remove it before you can add it. See Remove an AirTag or other item from Find My on iPhone."
Add an AirTag in Find My on iPhone
Let us know if you have any questions.
Thank you for using Apple Support Communities.
Take care!