Thank-you for the replies....
I see how painting over with white could be a solution,............. but not an answer to the question.
Is there an eraser and no it cannot be used.
I have tried everything I can think of to make it work and it does not.
Erasing is a simple straight forward thing to do so can paint.net do it or not?
I know I am comparing it to a much simpler tool but this is not reasonable to my little brain that an eraser symbol is there yet it does not function AS an eraser.
All I have found in this forum are work around solutions that do not apply to a simple computer copy of the simplest line drawing.
Undo.......yes I see that if I want to change something after my last pencil or brush stroke I can use UNDO but what if it was 10 moves ago???
It is starting to look like this tool is not named properly as it has very little to do with drawing as apposed to manipulating photos or creating something in layers since that word is so prevalent in the responses.
I am coming at this as a sketcher who still uses the old fashion messy methods,.....paper, pencils, charcoal, and paint.
Anyone know of a program that would suit my needs better.