In step 3, stretch the other arm overhead and then reach down the back for the other end of the strap. (yogajournal.com)
You can adjust one end of the strap independently of the other. (kingofthegym.com)
(If you find it difficult to reach your leg, wrap a strap behind the knee, hold one end of the strap with each hand, and gently bring the knee toward you.) (yogajournal.com)