installing mods into cod4

i need help when i try too install flyer mod i put it in the modsfolder go to cod4 and go to mods and flyer mod aint there aso when i delete mods from the mod folder when i go to cod4 the mods that i deleted are still there and if i launch them i can use them thanks hope you can answer both questions

You need to ask this to the admins of the company where you buyed the server. At least this is how it was. But you can't put mods in yourself.

you must to use some mod loader i think