Once you have chosen a product (and layout, if applicable), you will be able to add a personal image(s) from your Instagram or Facebook account. Simply connect either account from the appropriate button in the product menu. Select your photo(s) from the available feed and complete the upload to add them to your photo gallery.
To upload from your device, click the "Upload Image" button in the product menu. Navigate to where your image is stored on your computer or mobile device. Once you have selected and completed the upload function, it will be added to the photo gallery.