Car question

I have a 1996 Chevrolet Beretta and the A/C is blowing air that isn't cold, it's more like.. Warmish. I can't find the spot I need to put freon in it either, any advice or links I can get that can show me where I can put freon in my car? It just got out...

of the shop too, but they failed to put freon in it.

Thanks.

maybe you need new hoses cause in our car the air conditioning was acting up and we replaced the hoses and then it worked fine

Nothing wrong with the hoses, they have been checked out already and they are just fine, but ever since the day it came out it hasn't had any freon on it so I am trying to find out where exactly those caps are that I need to attach it to.