I'll bet you filled it with the engine off. The pipes getting cold is a good sign.
Start it and put another can in it. Lo side only.
It takes 28-30 OZ to fill it, one normal can is just 12 OZ. There may be a sticker underhood telling that.
Close doors and windows, Stick a thermometer (a meat or oven thermometer works fine) in the center dash outlet. AC on MAX, blower on full blast.
Watch it close.
As you add it will reach a low point in the temp, then go back up. At the lowest point STOP - it's full. A good reading is 50 degrees or lower.
Depending on how empty it was, it may need another 1/2 can or so beyond that.
No more than 3 cans please - else you can blow something.