The most common reason for this issue is that information is missing. Be sure to note any error messages that may be displayed in pink at the top of the page after attempting to add to your cart.
In particular, make sure that you've selected the Attachment type for your badge after you've created it. The Attachment can be selected from the five pictures directly underneath where you created your custom badge.
Then, click the "Add to Cart" button at the bottom of the page.
If you continue to experience issues adding a badge to your cart, please call us at (877)404-8413.