As a Billpay user, simply log onto the My3 App and the My3 Dashboard screen will automatically display. From here, tap the PAY BILL tab. Next you will be asked to enter the amount that you wish to pay along with your credit / debit card details. Once you have entered the relevant details tap the Pay Bill button to complete the transaction.
You can also pay a current or overdue bill by going to the Bill History page and then opening the relevant Bill details page. Where a payment is required you will see a 'make a payment' button appear on the bottom of that bill details page.