Step 1: Open the Existing Order
Go to the Orders list and tap the order you want to modify. (e.g., Dine‑In · Order #000002).
You can also tap the table to open its existing order under spaces.

Step 2: Click "+ Add Items"
In the Order Details screen, tap "+ Add Items".

Step 3: Search or See Menu to Add Items
Search or click "See Menu" to add item
Then click "Confirm"
