So you're a nonprofit organization and you need to add the credit card that is charged for your selected plan(s).  Follow these simple steps:  

Step 1:  Go to https://purecharity.com/ and "SIGN IN" to your Pure Charity account.  

Step 2:  Select 'Managed Field Partners' to be directed to your Field Partner Dashboard.

Step 3:  From your Field Partner Dashboard, select 'Billing' on the left-hand menu and your Billing and Plan Management screen will appear.  Select 'Add new payment'. 

Step 4:  Your Monthly Subscription screen will appear.  Enter the credit card that you would like to use to pay for your selected plan(s).  Once you've entered all information select 'Submit'.  You will be asked to verify that you want this to be the default payment source for any future recurring charges.  Select 'OK'.  

Step 5:  You will be automatically redirected to your Billing and Plan Management screen.  Confirm that your card saved correctly.

Still need help, reach out here help@purecharity.com.