First of all, thanks for the support, you're awesome! Secondly, to order more than one of a particular pledge level simply double (or multiply with how many you'd like) the amount you're pledging, but you only pay for shipping once, we comp the rest. It's the least we can do.
If you want to order two (...or more) of different pledge levels, chose a pledge, then add the amount of the other pledge level. After that is done, don't forget to send us a message to clarify which other product or Combo you'd like.