Once you have located the item you are looking to purchase you can click the Add to Cart button on the right side of the product. You can view your cart at any point by clicking the cart button on the middle header of the screen.
The cart button is located in the middle header of the screen to the right of the search bar. Inside the cart you can view a list of all the products and the quantities you have added. Along with the pricing of each.
Please review the information in your cart before you checkout. This is where you will add any line notes or update any quantities.