Instructions: after entering personal info. Check the box for item you are paying and enter the quantity. There is also a custom amount box with a default price of $1 so just change the quantity for the amount you want to pay. There is a total column just above the bank info section which shows the amount you are paying. After submitting the payment be on the lookout for an email asking you to verify very small charges made to the account you are using for payment. You will need to confirm these amounts for your payment to go through. Be mindful this can take several days for your transaction to occur.