2006 Mazda 3 Compressor clicks on and off

Air Conditioning problem
2006 Mazda 3 4 cyl Front Wheel Drive Automatic

I have a 2006 Mazda 3, my husband and father recently added some air condotioning coolant to the air because it's been so hott out. Well after they did it my compressor now turns off and on constantly. The air is very cold while the compressor is on but once it turns off nothing but hot air will blow through until the compressor comes back on. I am not sure if there is a way to fix this myself.