You may encounter an issue when entering our Developer ID on the MWS authorization page.
If you're unable to click on the "Next" button, then check that our ID is correct. If it is correct and you're still unable to continue, then try entering our Developer ID manually, with or without hyphens.
Developer's Name: SellerZen
Developer's ID: 4966-7670-9125
Manually entering the Developer ID should allow you to continue. The "Next" button should fill and allow you to continue.