Credit Cards used to be selected on Giving Forms but during the 10.4 Release on April 8th, 2015, this changed and they are now set on the Payment Gateway itself. To set credit card types for a Giving Form:
1. Go to > onMessage > Settings > Giving > Payment Processing 2. Select Edit for the Payment Gateway 3. Check off the cards you would like to use 4. Click Save
These Credit Card types will now be used for any form that has this Payment Gateway.