I want to edit my order in the shopping cart.

To edit customization values for an item that is already in the shopping cart, simply follow these steps: 

1) Go to your shopping cart and find the item you want to edit.

2) Click on the product title to access the product page.

3) A pop-up dialog box will ask if you want to auto-fill your previous customization. Click "Yes, go ahead" if you don't want to start all over again. 

4) Make changes to your customization values as you wish and add the new item to your cart.

5) Your shopping cart will now have both old and new items, please remove the old item before checking out.

That's everything needed to be done!