To make a payment you must be logged in or create an account:
Create Account: Sign up and log in to your account. See this article on creating an account.
Access Payment Section: Once logged in, select "Payment" from the menu.
In-App Payments Option: If your supplier has enabled in-app payments, you'll see a "Make Payment" button after logging in and navigating to the payment section.
No In-App Payments: If in-app payments aren't enabled, you'll find a "Mark as Paid" button along with the supplier's bank details.
Delayed Payment Option: If you can't see either option, your supplier might set them to appear closer to the payment due date. Check back at a later date to make the payment.