Go to AQHA - AMERICAN QUARTER HORSE ASSOCIATION
and look for member login on the right. There is a spot that says "get a pin". Click and a new screen will pop-up. Plug in the number you were given at sign up....it should be your membership #....and follow the directions. If it doesn't work, then you will have to wait on your card, mine took about 3 to 4 weeks.
Welcome to the forum and AQHA!