WELL, if you are instructing, WELL, I suppose youare a "certified" instructor.
There is no such critter in the AMA ranks as a certified instructor. Either you yourself, or your club may have such designation but that is all of it.
Vicman is fairly well confused about the Introductory Pilot Instructor program offered by the AMA. You can find the straight and accurate information on the web site or in your Club Secretary's Charter Kit.
Are you an AMA member? Is your club an AMA Chartered Club? If so then you have the address right there, and any phone number you might need is available in that magazine you receive each month, along with the website address.
http://www.modelaircraft.org/