If you have a two to sign account and wish to update or stop a pending payment that's been created in internet banking, you'll need to go to the Payment Approvals screen and reject the payment.
A new payment request will then need to be created through the payment screens and the second approver will be notified.
The account holder or signatory who created the payment request will be notified via email (if they have email receipts turned on) or via the internet banking dashboard.