If you are winning auction items, or have unpaid donations or raffle tickets, at the end of the auction you will receive a text asking you to pay. You will click the link to Bidr Mobile. Click the three horizontal lines on the bottom right of your screen to open the menu. Then click cart.
If you want to pay with cash or check you will need to see an auction organizer. To pay slide the checkmark to the right. It will turn green. You will see the card you have stored in the system. To pay with a different card you can click "add card."