1) Begin in seated position with your hands on the floor,with the foam roller directly above your heal.
2) Cross your legs .Slowly pull body backwards so roller glides up your calf. Move back and forth gently for 30 seconds, stopping at any tight areas.
3) To add more intensity rotate over tight muscle until you cannot handle the pain any further.
From my experience tight calves, can set of a cascade of problems from hip to neck. Try this everyday for 2 weeks and reap the rewards.