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.

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