The variable will determine if the amount is subtracted from the player's fame (1) or infamy (0) with the faction.
The key is the top left key under escape, on non-U.S. Other keyboards with different layouts will differ, but the key is usually to the left of 1 or just under the Escape key ( Esc).
keyboards, and the not symbol ( ¬') on UK keyboards. Use the backquote key ( `) while in-game (Unpaused).