To add one or more rewards on to your Kickstarter pledge, follow these steps:
At the top of the Kick Asteroid! Kickstarter page, click on the “Manage your pledge” button. Or, if you haven’t yet pledged, it will say “Back This Project.”
Increase your pledge in the Pledge Amount box by the dollar total for the add-ons you would like to include. For instance, if you have pledged $28 for the t-shirt and want to add $15 for the sticker set, your new total will be $43 ($28 + $15 = $43).
You do not need to change the tier of your current pledge. If you do change your pledge level, you will need to add the total for your add-ons to the amount for the new tier that you have selected.
At the end of the Kickstarter campaign, you will receive a post-campaign survey that will ask you questions about your rewards (things like t-shirt sizes and such), and you will be able to explain how you would like to apply the extra pledge dollars.
Do I need to add shipping and handling?
Unlike the reward itself where shipping and handling are added separately, shipping and handling for add-ons must be included in your pledge amount. Shipping and handling are generally included for backers in the US. Additional funds due for international shipping are specified with each add-on.
We’ve provided a handy table that can be seen near the bottom of the campaign page and in Update #14 which provides the amount to add to your pledge, including shipping.