Here is a quick picture guide of how to change your pledge:

1. Your original pledge (chosen during the campaign) is visible on the right side of the picture.

2. If you want to change your pledge you need to click the “upgrade pledge” button. After that you will be redirected to the pledge section, where you can choose a different pledge by clicking the “add to pledge” button.Keep in mind, this does not automatically EXCHANGE the pledge level in your order, but add the one you'd like to choose. You'd need to remove the old pledge from the pledge before the checkout.
Please notice: The “add more addons” button redirects you to the page with the addon section. It doesn’t instantly change anything in your pledge.

3. After choosing your new pledge you need to confirm your choice by clicking the “confirm” button.

4. After that you will be redirected to another screen where you can either “continue browsing” the pledge manager or go do the checkout section - “submit pledge”.