● First you need to enable Touch ID on your Mac. Apple's official tutorial: How to set up Touch ID for your device
● Open Desktop. [Menu] - [Touch ID] - Turn on
● Click [Touch ID] to set the scope of fingerprint recognition. If you are concerned about someone trying to use your fingerprint without your consent, please turn off password-free payment and view recovery phrase/private key in Touch ID to keep your Hot Wallet assets safe.
Security guidelines for using Touch ID can be found at: About Touch ID security in Desktop for Mac
● Now you can use your fingerprint to unlock Desktop, but don't forget your Desktop account password, which you sometimes need to enter instead of using Touch ID.