Throwing grenade control key

I just changed the "L button - Throw grenade" control to something else and when I tried to change it back, I couldn't find the "throw grenade" control. So how do I throw grenades again.

In OPTIONS use LOAD DEFAULTS
Is solution

you have to manually set in in the config.cfg file its a impulse just swap that button with what ur gonna use . but do it in the cfg file not ingame

Alright, about to try it now.