An add-on is an optional item that can be added to a Kickstarter pledge without changing pledge levels. Please note that if you select some add-ons starting from a PDF-only pledge, you'll be charged for shipping fees.
In general, you should be able to select an add-on by doing the following:
1. Click the “Manage your Pledge” button on the project’s page.
2. Increase your pledge by the amount needed to claim the add-on(s).
3. Save your pledge. Do not change the tier that you originally pledged at.
You will choose your add-ons in the pledge manager after the end of the Kickstarter campaign. You will also be able to change your selection later in the pledge manager. You will receive a BackerKit survey to your Kickstarter mail that will introduce you to the pledge manager.
Please note: add-ons will increase the weight of your pledge and may increase the shipping costs. We work hard to keep these costs as low as possible.