On an iPad with a Home button, iPad (10th generation), iPad Air (4th generation and later), iPad mini (6th generation), or iPad mini (A17 Pro), you can use Touch ID to securely and conveniently Apple Account password when you make your first purchase from the App Store, Apple Books, or the iTunes Store. When you make your next purchases, you’re asked to use Touch ID.
Note: If you can’t add a fingerprint or unlock your iPad using Touch ID, see the Apple Support article > Touch ID & Passcode.
If you added more than one fingerprint, do one of the following to identify its print:
On an iPad with a Home button: Rest a finger on the Home button.
On iPad (10th generation), iPad mini (6th generation), iPad mini (A17 Pro), and iPad Air (4th generation and later): Rest a finger on the top button.
Tap the fingerprint, then enter a name (such as “Thumb”) or tap Delete Fingerprint.
Go to Settings Change when iPad automatically locks