I just tried editing a form in my Mac and I had the same experience - you can't right click in a cell and edit it, on any form or worksheet I tried.
You could try deleting the forms and worksheets related to this issue and enter the information in the interviews about the withholding and other payments again for Federal and State. You could also choose in the interview section to allow the state to calculate the penalty and respond to their notice if you disagree with their calculation.
The Form OR-10 instructions explain the Oregon penalty calculation.
I will elevate the question regarding the lack of ability to edit forms in the Mac version.
@DarthVaderKamp
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