To change your funding source, head to your Settings > Banks & Cards in the Venmo app. You should see a list of the bank accounts and cards that you’ve added to your Venmo account. The bank or card that is marked with "In use - payments to friends" is the source that will be debited when making a payment (that is larger than your Venmo balance).
Feel free to change your primary funding source at any time by heading into the settings menu, and tapping on the preferred payment method. You will see a checkbox that says “Payments to friends when Venmo balance is not enough” as well as any fee indicated. Check that box and you’ll be all set!
You also have the option to change and view the funding source that you have set for your purchases in other apps on the same screen.
Please note: the funding source for a payment cannot be changed once it’s been sent. The moment you send a payment in Venmo, the funds are authorized to be withdrawn from your funding source and made available to your friend. We always recommend double-checking your primary funding source before sending a payment!