The Quick Pay menu on the accounts overview screen allows you to choose to pay up to 10 of your saved payees / billers quickly and within a few taps.
To add any of your saved payees/billers to this menu, simply tap on the
symbol to choose a saved payee / biller you want to add.
On the Payees screen you can designate the account you want to be debited when you make a quick pay payment.