Extra Wolf Rider badges are a $40 add-on to any pledge $20 and up.
Extra Little Red's Basket badges are a $70 add-on to any pledge $20 and up.
Extra Grandma's Storybook badges are a $110 add-on to any pledge $20 and up.
Press the "Manage" button above. If you have not pledged yet, it will say "Back This Project."
Click on Change your Pledge.
Increase your pledge level in the "Pledge Amount" box by the total of the add-ons you want to add.
After the end of the Kickstarter campaign you will receive a BackerKit survey that will allow you to assign the additional amount pledged to other rewards.