This is where you stock products yourself (e.g in your house) and also pack and ship these orders too.
If you're going to be packing and shipping orders yourself, then we must set the default fulfillment service to be "manual":
Click on Settings in the top right hand corner
Click on Orders
Under "Default Fulfillment Service", select "Manual"
Under "Allow Customers to Reorder Previous Orders", select "Enabled"