There are two ways of moving questions:
1) The Question Transfer function
In the create course area, click the transfer button (next to the new level button) to move questions between levels. You must have at least 2 levels in a given chapter to do this. Question transfer only allows questions to be transferred between chapters within levels in the same chapter. To move questions between chapters, drag and drop them onto the level selector on the left after opening it.
2) In card view, click the drag button, and drag the questions onto the left navigation (level listings) to move them into other levels.
Note that transferring questions will retain history - but when you are next learning, you may have to answer
several questions for the correct counts to correct themselves in each chapter or level.