The first thing that you want to do is to put the ipod, and USB cable and put them together. Then after that plug the USB cable into the USB port on the PS2.
Step 2: Turn on
Turn on the PS2 and wait for the ipod to respont the the power. You should see the charging symbol and the play list or whatever screen it was on before you turned it off last.
Step 3: THE END
In the end you will find that this is the best was to charge your ipod next to the computer. I aslo found out that you can charge your ipod on the x-box 360 too. just remember to turn off your ipod while charging and keep the PS2 on or there will be no charge.