Touch ID preferences
If your Mac has a Touch Bar, use Touch ID preferences to enable your Mac to be unlocked with your fingerprint, add one or more fingerprints to your user account, and enable Touch ID to be used to make purchases with Apple Pay and from the iTunes Store, App Store, or iBooks Store.
To open this pane, choose Apple menu > System Preferences, then click Touch ID.
Add a fingerprint
Click to add a fingerprint to the current user account. To rename a fingerprint, click the text below the fingerprint, then enter a new name.
You can add up to three fingerprints per user account (your Mac can store up to five fingerprints total).
Unlocking your Mac
Select to enable your Mac to be unlocked with any fingerprint added to the current user account.
Select to enable the current user to approve Apple Pay purchases using Touch ID.
iTunes & App Store
Select to enable iTunes Store, App Store, and iBooks Store purchases with Touch ID.