On your Mac, make sure the camera you selected in head pointer options is on.
If you’re using your Mac computer’s built-in camera, a green light beside the camera (at the top of the display) glows to indicate the camera is on.
Center yourself in front of the screen, making sure your head isn’t too far to the left or right.
Depending on the options you set for how the pointer moves, either turn your face away from the center of the screen or move your head in the direction you want the pointer to move; you don’t need to exaggerate movements, or move your shoulders or body.
For example, to move the pointer to the right, turn your face toward the right edge of the screen or move your head to the right. The farther you turn your face to the right or the faster you move your head, the faster the pointer moves across the screen.
To stop the pointer, either turn your face to the center of the screen or stop moving your head.
When the pointer is at the location you want, you can perform left-click, right-click, or double-click, or drag-and-drop actions using Mouse Keys, switches (such as keyboard keys, assistive switches, or facial expressions), or Voice Control.
If you specified a switch to pause or resume head pointer in head pointer options, use the switch to pause it at any time. For example, if you specified the keyboard key “z” as the switch, use the key to pause head pointer when you’re away from your Mac for awhile.