2001 Oldsmobile Intrigue a/c

Hi! I recently changed the a/c clutch, pulley and clutch coil on the above car. I accidentally evacuated the freon when doing so. (I did not realize that would happen when I pulled the coil snap ring out.) I put it back together, though, and tried to refill the freon. I jumped the relay for the a/c clutch to force it to engage so I could refill it but nothing will come out of the refrigerant can. The clutch definitely engaged when I jumped the relay - I could see it engage. I even read about a trick of pouring hot water on the can to force it into system and that did not work either. Not sure if the only other alternative is take it to a shop. Any help appreciated - thanks!