When you add an item to your order form you will be brought to the page shown below (this is just an example and may look different depending on all the size and price options available):
After you have selected your desired photograph size you then have to enter the quantity you wish to order. Now click the "ADD TO CART" button (if you want to add the same photo but at a different size, repeat the "ADD TO CART" steps from the thumbnail page). You will now be taken to the next step:
To delete items you do not want anymore tick the checkbox(es) above the recycle bin(s) and press the "DELETE" button. To review your items as thumbnails click the "VIEW THUMBS" link at the top in the "NAME/ID" column. To continue adding items you can either use the Category Menu on the left of the page or the "Continue browsing at the current CATEGORY" near the bottom of the page (this link at the bottom will take you back to the last thumbnail page you were on).
When you are done adding items to your shopping cart you can click the "PROCEED TO CHECKOUT" button to go to the Details form.