Car Moving wrong way backwards

Hello! im new to unity so sorry if this question sounds stupid but bassically i made a car movement script and it works all good but when i move backwards it moves in the oppisite direction,So i tried to make it so that the rotation would be negative when moving backwards but that didnt work so does anyone else have a good idea?

Can u show your code

@REDCRAFT123 the code is in the comment section or whatever its called