Download the template for your project and design according to the guidelines. Ensure that your document has an 1/8th of an inch bleed, all text is converted to outlines, and the image resolution is at least 300 ppi.
Save your design as a PDF; if there are multiple pages they should be in the same PDF file. Make sure that all pages are the same size. Double check your file(s) and upload your PDF using the order form found on the right of the product page.