A/C not cold. Compressor clutch not spinning.

[DanSanDiego]

Hi,
My A/C is blowing just fine but the air it is blowing is not cold (~80 degree air). My A/C compressor clutch (outside circle by the belt) is not spinning. The auxiliary fan is spinning all the time (whether A/C is on or off). I have read many posts on this type of issue but could not find out how to locate the A/C compressor relay (is it behind the glove box?) in order to short it and try to get the clutch to spin.
I have tried adding refrigerant but interestingly the pressure in the system at the low connector was well above 55psi (actually above 100psi), so I let pressure out at the high connector while also adding refrigerant at the low connector. Now pressure is 50psi at the low connector.
Any advice or direction on locating the A/C compressor relay (or another way to test the A/C compressor clutch?)?
Thank you.