Recharge A/C No low side port?

No low side port? Need to get an adapter to fill. Trying to fine one. Found r12,r22 to 134a but I I don't know for sure. I just want to charge my a/c was parked for a while then took on trip. Ran great a/c never got cold just cool. This picture shows what iam trying to do. This picture shows low side but no where to add i did unplug and says to jump the connector when filling. But I need. An adapter. Can't find.