Hi
You can become a Qigong instructor by attending the eight Qigong seminars, sometimes more than once is needed, and studying for a few years. After a while, you take a test with Dr Yang to become an assistant instructor. Then, after teaching for a while, and staying in touch by visiting and studying further, you can take a second test for Instructor rank. It takes a number of years.
http://www.ymaa.com/seminars
Boston:
February 20-21, 2010 Qigong-1 (Qigong Theory and Spine Qigong)
February 27-28, 2010 Qigong-8 (Muscle/Tendon Changing and Marrow/Brain Washing Qigong)
California:
August 6-13, 2010 Taiji Ball Qigong
August 13-20, 2010 Qigong-1 (Theory and Spine Qigong)
August 20-27, 2010 Qigong-4 (Soft Qigong)