Just send in a support ticket and choose "Refund Request" as the reason for the ticket. We have a 30-day refund policy for any products we sell.
Please let us know in the ticket why you are getting a refund.
PS: If it's a product that was shipped to you, you'll need to ship it back.
Send in your refund request here: http://photowhoa.freshdesk.com/support/tickets/new