Step 1: Lie on your side, you can support your upper leg on a bolster or towel if you wish. Make sure to keep less than 90 degrees of hip flexion.
Step 2: While maintaining the bottom shoulder in contact with the floor reach with your upper arm, keeping only a very little bend in the elbow, toward the floor on the other side.
Step 3: Stop when you feel a stretch, breath, and then try to move further.