Hey I my friend came over my house and i can't seem to log out of my account so he can log on to the game. How do i get the game again to ask what my account and password is?

Hey I my friend came over my house and i can't seem to log out of my account so he can log on to the game. How do i get the game again to ask what my account and password is?

delete iw4m.ini or delete the stuff inside of it

OH ok because he was on the second computer with my account also logged into that and when they both opened because we thought it would prompted us to log in it closed both of the games. Is that going to ruin anything since it auto logged us both into the game at the same time and closed both of them?

 

Thanks