1. Go to your Ramadan Challenge Homepage by visiting LaunchGood.com/Ramadan/Challenge.
If you are not signed in to your LaunchGood account you will have to sign in. 
2. Click on Adjust Settings
3. Here, you'll be edit your settings and adjust your Payment details. You can select another saved card from your profile or add a new card:
Add a new card
6. After you've made your changes, hit Save
If you need help with anything else, please check out the rest of the solutions articles for the Ramadan Challenge, or reach out to help@LaunchGood.com!