How the fuck do you put a half face respirator on?

[FreddiRox!]

I didn't know where to post this, so I guess I'll just post it here seeing as I'm planning on using this for Airsoft.

So I brought this Half mask respirator that I planned on wearing at Airsoft (In before "You won't be able to breathe well enough!" No, I can) but I don't know how to wear it - I've tried Google and I've tried reading the manual, but no where does it say where on your face this respirator goes, so anyway, do I place the mask under my chin on or on my chin - Also my fucking £60 drum mag isn't feeding because its a massive cunt.

[FokkerBoombass]

Think it should go under, so it's sealed properly.

[FPKawaii]

Okay, it goes under your chin and over your nose. One strap goes over your neck, and the other around your head.