If you have multiple payment methods enabled in your account, your users will be able to choose their preferred payment method in the transactional forms on your website. The first payment method in the list will also be selected.
However, depending on the payment methods configured in your account, it is possible that the one selected by default is not the one you want to promote to your members.
To change the payment method that appears first in the list, go to the "Accounting / Settings" menu. There, click on the "Payment Methods" card.
You will then have access to the list of payments configured in your account. Use the icon in the "Order" column to drag and drop the payment methods into the desired order.