How to put freeon in a Honda Accord?

My a.c in my car use to work just fine really cold a.c but now its throwing out hot air. I have a 1990 honda accord. How do i put the freeon or what type should i buy for my car? It would be very helpfull if you guys would post an image if possible to get a better look at where i should put it on. I have no clue how to do this and i live in florida its too hot to just drive with the windows open.

This is a job for a professional no matter how you look at it. It originally used R12, which is now only available to licensed A/C techs and is incredibly expensive… The last number I heard was about $50 per lb and that was years ago. It may or may not have been converted to R134a, and it may or may not be an adequate conversion. If it is an adequate conversion, the weight of refrigerant has changed completely. An auto A/C professional will be able to tell which of these conditions applies and the cost for a basic service.