To change your credit card information for your current subscription level:

1. Login to your account on SpotGamma.com
2. Click on "Account" under the "Members" dropdown in the menu bar
3. Click on the "Subscriptions" tab on the Account page
4. Locate your active subscription level and click "Update"
5. Update your credit card information on the page provided

If you would like to switch from paying via credit card to paying via PayPal you will need to cancel your active subscription and start a new subscription selecting PayPal as your preferred method of payment.