How to get Face ID?

All models of iPad in recent years support either TouchID or FaceID - but not both.

All iPad models that support TouchID have a physical Home Button at bottom centre of the screen - within which is the TouchID sensor - or for iPad Air4, Air5 and mini6 incorporate the TouchID sensor within the Top (Sleep/Wake) button.

iPad models supporting FaceID, such as the iPad Pro, have a FaceID sensor (consisting of an Infrared Dot Projector and TrueDepth Camera array) - this sensor being absent from iPad models that support TouchID.

What model iPad do you have?

Only certain iPad Pro models support FaceID.

You may wish to start with this link:

Set up Face ID on iPad - Apple Support

How to get unlock face id

My Face ID some problems create