Support at J and T''s Art and Calligraphy online shop
You can change the quantity of items in your cart, for example if you have 1 greeting card in your cart and you want 2 of them, then under the quantity column next to your item change the 1 to a 2 and then press "Update Totals" and the cart will refresh showing 2 greeting cards and the prices accordingly.
https://www.jandtsartandcalligraphy.co.uk/online-shop/support.php