From a Computer:

You can go to this this link, or follow the directions below:

1. Go to www.prepear.com, and sign in to your account
2. Click on your account profile (the profile picture in the top right corner)
3. Click Account Settings from the dropdown menu
4. Select subscription from the left hand menu
5. You can then update your payment method from this screen

From the app:

1. Open the Prepear app and make sure you are signed in
2. Tap on the "Me" tab on the bottom right
3. Tap on "Settings", under your profile picture
4. Tap on "Billing", from the menu
5. You can then update your payment method from this screen