Editing of the grid is assisted by a coloured cursor cell. Any editing commands you give are applied to the
cursor cell and to its reflections as specified by the selected symmetry. Firstly, you must select the cell you wish to edit. Do this
by pointing to it with the mouse and clicking the mouse button once, or you can use the cursor control keys if you prefer. Secondly,
you will convert this cell to any one of
Fifteen different cell types .