Answer to: Can I use other bits in this screwdriver?Yes, it can fit other size and style bits, they just need to be of the same diameter as the ones provided, 1/4 inch bits. Also note, do not get bits that are to short or they will become stuck in the screwdriver. If you are having other problems with the LI2000, please see the troubleshooting page.
Answer to: How do I get the driver to spinUnlike traditional drills with a trigger in the handle. The Black & Decker Li2000 is activated by a button at the top of the screwdriver, it is the same place as the Forward/Reversed selector switch. If you have other problems with the LI2000 check the troubleshooting page.
Answer to: What is the selector for at the tip of the screwdriver?It is the indicator for the screwdriver to be in either auto mode where the motor in the drill activates to spin the hex bit, or in manual mode is when you use the screwdriver as if it were a traditional handheld screwdriver(without the motor, spinning with your hand.) manual mode could be used if the screwdriver is running low on battery life and you don't have a screwdriver on hand. Take a look at the troubleshooting page for the LI2000.