You can follow the methods to use your keyboard as a mouse: Launch System Preferences > Locate Accessbility > Open Pointer Control > Select the Alternate Pointer Methods > Tick the Enable Mouse Keys > Then use 7, 8, 9, 4, 6, 1, 2, and 3 keys to move your mouse cursor, and the 5 key to click if you have a number pad on your Mac. Press 7, 8, 9, O, U, J, and K keys to move your cursor into responding directions and the I key to click.