I can't seem to edit OpenCat h. to change the name to Nybble, rather than Bittle. Without that I can't actually load a workable program for Nybble. I'm certain I'm missing something here and it probably relates to the fact that I'm not really computer literate. I can open up a text version of Open Cat h. and see the line of code that needs editing, but I can't do it! What am I doing wrong?