Hook the power amplifier and mixing board to a surge protector.
Connect one microphone cable from the left "XLR" output of the mixing board to the left "XLR" input of the power amplifier.
Connect the second microphone cable from the right "XLR" output of the mixing board to the right "XLR" input of the power amplifier.
Connect one speaker cable from the left speaker output to the left speaker input.
Connect the second speaker cable from the right speaker output to the right speaker input.
Connect the third microphone cable to the first channel of the mixing board. Connect the other end of the microphone cable to a microphone.
Turn on the mixing board.
Turn on the power amplifier.