How do I unhide columns? When I want to send final reports it does not allow me because of an error in a hidden Column.

You can right click on the column header and select unhide, here is an image showing how to do it:

I wish I saw "unhide" when right click on the column. It only shows "hide"

You have to select multiple columns. For example if you see Column A and Column C (therefore Column B is hidden) then select columns A to C and then the unhide menu item will appear.

Thank you!