Hello,
Please call us a 1-800-800-8517 so we can get this fixed for you. We can't really add onto an order that's already been placed because credit card has been authorized for the amount already but we can get a separate order done for you and have it shipped it with the original order so you are only paying one shipping cost. You can either email us or call us but we can get this fixed for you :) Thank you!
~Kristi @ EXS