How do you remove an ipad from an apple account and attach a new one? In particular deleting an old ipad mini and putting an ipad 9th gen on in its place?

To remove an iPad from your Apple account and attach a new one, you'll need to sign out of your Apple ID on the old iPad and then sign in with your Apple ID on the new iPad. Here's how to do it:

1. On the old iPad, go to Settings > iCloud and tap "Sign Out".
2. Tap "Turn Off" to confirm that you want to sign out. This will remove the old iPad from your Apple account.
3. On the new iPad, go to Settings > iCloud and tap "Sign In".
4. Enter your Apple ID and password, then tap "Sign In". This will attach the new iPad to your Apple account.

I hope this helps! If you have any other questions or need further assistance, please don't hesitate to ask.