How do you 'wear' a bra?

Well if you are wanting to wear a sports bra, you just pull it over your head, kind of like a tank top, then wear your shirt over it. If you are wanting a cupped bra, you place your arms through arm holes and fasten it in the back with the snaps

A different answer Just pull it over your head and put the straps over your shoulders and tighten the straps to your size and put the snaps in place, depending on the size of your waist..

so just pop your boobs in and maybe do it up at the front and then twist it round