How do I fill a refrigerator with freon? My frig has a slow freon leak
and I want to wait a bit longer before buying a new one. The last
repairman was able to fill it but said he had no more freon (its not 
made any more.) I am able to get freon but do not know how to put it
in. Any tips?

Aside from the environmental concerns (freon is banned for a reason)

 it is rather simple to add freon to the fridge, there is a nipple for
it usually on the collector (the bottle shaped item) to refill the
freon