The basic prerequisite for doing specific exercises on the balance board is first of all to be able to keep your balance safely.
To begin with, stand on the board with your legs apart, keep your back straight and hold on to something with one hand (a wall or a banister). Then slowly let go of your hand and try to keep your balance on your own without the balance board hitting the floor.
The constant balancing alone activates your deep muscles. Keep your hips loose on the balance board so that you can balance properly.