Multiplayer horn

[ST3FF3N]

When i am online in the game, i cant hear when other people are using their horn. 
I can see the horn symbol appear, but there is no sound. I have read that you can pres TAB,

to enter a menu where you can enable horn sounds. But when i press TAB i cannot move my mouse, 

into that screen to press settings, i appears that the mouse is moving under the TAB menu. 

Is there another way for me to enable horn sounds?

[[S.PLH]Warrior]

after pressed tab key right mouse button will overlay a yellow cursor then you can go to settings 

[ST3FF3N]

Thanks. problem solved

[_Ben]

Moving to solved