You can change payment methods as follows:

Before place your order, you can choose the payment method you want or change the one you don’t want.

If you chose paying with PayPal and placed your order, you can change the payment method in My Orders.

Login to My Orders and choose the order you need help with. Click on the order number to view more details.

Click on Change Payment Method and make your choice.

If you chose paying with Western Union or Wire Transfer and placed your order, you can change the payment method as shown on the following screenshot. Of course, you can also make your choice in My Orders.