Whereas meditation is often practiced sitting cross-legged, you do not need to assume this pose. The most important in how you sit is a comfort. You will be spending some time in this pose without moving, so if something brings you discomfort, this will only take your attention away from the practice.
We suggest you start practicing in sitting before you try lying flat, but you can sit on the chair, on the floor with your back against the floor and legs extended in front of you or if that’s comfortable – crossed-legged. When you choose the last one, pay attention to the position of your knees – they should not be above the level of your pelvis. When your hips are closed, and your knees do not reach the floor, but you still want to practice crossed-legged, put a few yoga blocks or cushions under your butt to lift the pelvis up.