ShipTurtle does not cancel orders on your online store from its interface. You need to cancel it at from within your store itself. This is done to minimize editing of any of your store data from ShipTurtle.
Any order which you cancel in your store will however be tagged as CANCELLED in ShipTurtle also automatically.
Also, if you decide to “cancel” an order in ShipTurtle, it will simply get removed from our database and not change anything in your online store.