You have 2 options: 1. When you're on the product page select "Get Started Now - YES". A number of extra fields will appear allowing you to name your project, and add extra printing options. One of those options asks whether or not you want to upload your files now. From there just click YES and add the file(s) you want to upload.  2. If you want to upload your files at a later date, or maybe you just have the audio ready now and want to send the artwork a little later. Place your order online and you'll receive an email with your order number and an upload link. From there you can upload your music and artwork together or separately. We have a HUGE 20GB transfer limit which is more than enough to handle any project.  Note: You can upload your files at any time using the Upload button at the very top of all our website pages.