How do you activate the wall hack?

I understand this sounds noobish but please help me out...
This makes you walk through walls right? So what key do you push? I changed the settings to this
[settings]
wallhack=1
chams=1
nospread=1
norecoil=1
fullbright=1
crosshair=1
nofog=1

[chams]
//FRONT TEXTURE COLOR IN RGB
fr=255
fg=0
fb=0

//BACK TEXTURE COLOR IN RGB
br=0
bg=255
bb=0

//TEXTURE WIREFRAME: BECAUSE OF REQUEST, SETS THE BACK TEXTURE WIREFRAME
//1 for true, 0 for false
btwireframe=1

Thanks for reading,
Jake

No, see through walls I believe