How to turn the power on and off
Short answer
First connect the mains lead to the speaker, then plug the power jack into the wall socket.
Ensure that the mains lead, power jack and speaker are compatible with your mains supply and wall socket.
Connect the mains lead into the mains input on the speaker
Connect the power jack to the wall socket
Caution: Always unplug the mains lead from the wall socket before disconnecting it from the speaker.