Welcome to the forums.
Just FYI, mods dont really like when you make 2 posts about the same subject. Find the correct section and post it there.
In this case, your post is best in the audio section, but also would do Okay in the SVT section:
To answer your question, there is no way for you to control your iPod from the stock headunit. The adapter you bought only creates an adapter allowing for an aux input.
You will find that the stock headunit in the car is pretty junky, and if yours hasnt broken, it probably will soon. Dont spend another dime on it, go grab an aftermarket one.