I'm not sure what you mean by status bar but it could be one of 3 things:
1. The top bar is the notification bar. Those icons can be changed depending on the applications you're using that will put notifications there. Check the settings of the applications.
2. The bottom four icons. Not sure how to change this on the default home program (pantheon). Check out Helix Launcher, it is way quick, uses less battery, and is way more customizable than pantheon. You can download it from the market. After you get that you can easily change the four bottom icons.
3. The top right corner icons? Those things change based on the type of phone/rooted mod you're using. Not sure how to change them other than throwing on a mod. Maybe someone can enlighten us?