Sadly, we got confused too! In all of our edits, we ended up saying one thing and doing another. In an earlier version of this page, we said we'd add your shipping via BackerKit. But we ended up configuring the Kickstarter to take your shipping as a part of your pledges, if you pledged for physical books. (So this obviously doesn't apply to the electronic only tiers.) Since we already had pledges when we realized our mistake, we're going with it. So your $6 shipping pledge in the US will automatically get added to your pledge here in Kickstarter. You'll still have the opportunity to configure and add on to your pledge later in BackerKit. Sorry for the confusion--let us know if you still have questions!