In some cases you have the option for selecting a paper type and/or finish. You can define this for each print item when in the Preview and Configure window, or in the Shopping Cart. See below some examples that may appear amongst the selectable options. These can vary from gallery to gallery or from photo to photo. Just keep an eye on the options to make sure you send the right order for you.
Shopping Cart Screen
Under Paper Type, select your choice of paper type..
You will need to repeat for each item you would like to select a paper type/finish for.
Preview and Configure Screen
Under Paper Type, select your choice of paper type.
Click Save and Close. You will be reloaded to the shopping cart.
Note: Clicking the [?] icon next to any item will provide more information.