How do I format my sd card with my iPad camera connection kit

You can't format it with the kit, you can only either do it via your camera or your computer - if you are using the card with a camera then formatting it in camera is probably better than via a computer.

You don't. There is no way to write to the SD Card. Nor any formatting capability.

Many cameras can format SD Cards.

The primary use of the Camera Connection Kit is to copy photos from the card, which was used in a camera, onto the iPad. Put the card in your camera and format it there by doing an erase.