Exchanges can be made by completing this form.
Before making exchange, consider trying to the sell the set(s) you have amongst your group and just purchasing the set(s) you need. We can fulfill a small order under 12 sets with a minimal shipping charge. The benefit here is you avoid the $24 flat rate exchange fee, and you make a little extra money selling the extra set you have.
Also, if you just received your order, you may want to wait a few days and see if any needs arise. We find that many groups need a small followup order for anything that was missed or some late undecided customers see the product and wish they would have ordered. 🙂