Once you have added files to your basket, you'll be asked to create profiles for your print. If you have not already done so, click on the link to create a new profile. You can select the size of the print, the colour, the surface and the mount. Once you have done that, you will be asked to name your profile and then save it. Now that you have a profile defined, you can continue and select the images you want printed and assign a profile to them, set how many prints you want and create the order.