It's not dumb question, it's quite small...
There is a tiny tiny button on CHIP next to pin header U13 that is used for turning CHIP on or off. If CHIP is off and connected to a power source, hold down the button for one second to power it up. To turn CHIP off (rather brutally), hold the button for 10 seconds. We recommend using the operating system to power CHIP off, but if you need to, you can use this button."