When the project is closer to shipping, we will send out a pledge manager which you will be able to tell us your address, add funds, and tell us which add ons you would like. If you'd like to contribute to the amount pledged now to unlock more stretch goals, you can add money to your pledge amount now in the amount of the items you would like to add.
If you are interested in getting any items from the Add-Ons list, simply adjust your Pledge Total, increasing it by the amount of the Add-On items that you wish to purchase. Later, you will be able to select which Add-Ons these extra funds will go toward in the Pledge Manager. The Pledge Manager will launch closer to the actual manufacturing phase, estimated for early next year.