How do I use the Audi A6 navigation system?

I've just bought a new Audi A6 and I can't figure out how to use the navigation system. I've read the manual but it's still confusing. Can anyone provide some step-by-step instructions?

To use the navigation system in your Audi A6, start by pressing the 'NAV' button on the center console. Then use the main control knob to input your destination. You can also use voice commands by pressing the 'Talk' button on the steering wheel. Remember to keep your eyes on the road and use the voice commands when possible.

I had a similar difficulty when I first got my Audi A6. The trick for me was to use the touchpad on the center console to input the destination. It's more intuitive and quicker. Also remember you can save your favorite destinations for easy access in the future.