How can I change my reward selection?

To change your reward selection while the project is still live:

On a web browser: Visit the project page and click the “Manage your pledge” button that appears next to your pledge amount. On the next page, select "Change your pledge", and then select the reward tier that you wish to change to. Next, you'll be able to add any available add-ons to your pledge. If you are pledging without a reward, simply update your pledge amount. Remember, it's only possible to select one reward tier at a time.

On the Kickstarter app: Go to your Profile, and click on the project under your Backed projects. Tap the Manage button, then tap the three dots on the upper righthand corner of the screen. This will open a menu of options—to change your reward or select add-ons, tap Edit reward. You'll first see your selected Reward and can change it if you like, then once that is confirmed you'll see available add-ons to add to your pledge.