A work order status can be updated from the work order task line on the work order. Go to the work order > Task line > Update line tab. A task status can also be updated on the plan board after the task has been scheduled to a resource.
Steps
Go to Work order project planning > Work orders > All work orders.
In the list, click the link to the selected work order.
Click Update line on the work order line tab.
Choose a status to update the work order to
Click Save.