14 is the upper left corner of the mark, please answer a bit more detailed, thank you!
Enter 14C, select "14", "point font" or "tool" button "superscript"".
The fastest and easiest way:Enter 14C first, then select 14, and press CTRL+SHIFT+ '+'.
First hit C14, then select 14, open the format, font, click the "effect" in "superscript" is fine.
