Sorry if this has been discussd before (I tried but couldn't find anything) ....
I am trying to edit a rule for conditional formatting BUT whenever I use the Cursor arrows on the keyboard (<- ->) instead of moving the cursor in the formula, Excel moves the selection in the worksheet and adds the new cell reference to the formula so ...
I have:

and my cursor is at the end of the line. When I try to move left to go tro the start of the formula, I get ...

In fact it doesn't matter where the cursor is in the equation - if I try to move Right or Left I get a cell reference +$#$#
I have tried Ctrl-Left, Shift-Left,Alt-Left, Alt Gr-Left, to no avail.
I guess I have selected some option somewhere but I'll be dammned if I can find it.
Can anybody help me ??
Mark