Need help with basic electrical stuff

Black on the ground of any input jack, red to red speaker output. Amp should be on. 

Check the DC voltage at the speaker output related to GND (e.g. XLR Pin1)

I think the designer wants you to measure the DC voltage of speaker binding posts to ground.

1. Turn on the amplifier, let it warm up about 15 minutes.
2. Set the digital multi-meter to DC voltage auto range setting.
3. Insert the positive probe into the "+" speaker binding post, place the negative probe on the outer metal ring of any RCA socket, and record the reading, please note that readings may be negative. (I do not recommend placing the negative probe on XLR socket pin 1 to avoid accidentally shorting the probe to other pins and causing more damage.)
4. Insert the positive probe into the "-" speaker binding post and place the negative probe on the outer metal ring of any RCA socket, record the reading, please note that the reading may be negative.
5. repeat step 3 and 4 on another channel.

Hope this helps.

Ty guys. Much appreciated!