The way that you sit on a meditation cushion will be dependent on the pose that you are trying to achieve. If you are using a round zafu cushion, you may wish to try the lotus or half-lotus position with your legs crossed and feet resting on your inner thighs. Alternatively you could try the Sukhasana pose with your legs crossed at a more comfortable angle. A square meditation pillow is ideal for poses where you are sitting on your knees, or where you need extra support at the ankles. Ultimately, a meditation cushion is used to provide comfort and should be used in a way that supports you to extend your practice.