Add-Ons can be purchased once you have chosen your reward level (i.e. Standard Dice, Extra Large Dice, Pair, ect..) and backed the project by adding the cost of the desired add-on to your pledge. Step-by-step:
1) Select and purchase a reward first
2) Returning to the campaign homepage, select the green "Manage your pledge" button near the top right
3) Select "Change your pledge" and enter the base reward amount PLUS the cost of the desired add-on
4) That's it! You will receive a survey where you can specify your add-on choice after the campaign ends.
If you have any problems or questions, don't hesitate to contact us!