It's an active electric and it takes a 9v battery.
I heard that changing the battery on the Applause Tenor is a bit of a pain. If you wait for someone who owns one, or Google around, you may find the instructions.
It's a pity the battery is so hard to change.
Other than that, just plug it in to an amplifier or PA system. Adjust the volume and tone to your liking (as well as the settings on the amp/PA system), and you can rock away!