I have a buyer who can't figure out how to add a couple pieces to his order. I have it all set up and have had tons of buyers do it; but since I've never added to an order personally, I can't really walkthrough it for this customer who's having trouble. So perhaps someone who has added to orders before can tell me how it's done on the customer side.
Thanks!
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https://www.brickowl.com/mystore/settings/order_settings