To change the order of your action step, hold down on it and wait until it becomes detached from the list. Then drag & drop it to its new position.
Each action step can be moved up and down in the list of action steps. However it cannot break out of it and become an independent tasks. We'll work on such a functionality for the future updates. At the moment, if you need to mark an action step as a task you'll have to copy its title and paste it into the "Add a new task" field.