2. Clikc Chart menu and select Data Source...
3. Highlight the Series you want to change
4. In the Name box, delete "o" you entered.
5. In the position you want put o in spuer, press and hold Alt key and then enter 167. You'll get your o in super.
6. All symbol has its Ascii number. As long as you know its number, you can enter it by using Alt-Ascii number.