You can edit any field in your course by double-clicking on it and making the change you want to. Press enter and the change will be saved.
To rearrange words within a level, hover over the left-hand size of the item, click and drag it.
You can change the order of levels by clicking on the level number in the 'Edit levels' view, and dragging and dropping it to where you want it. The numbering will update automatically.