Ah...Ok, this makes sense now...my confusion, sorry...
You should aslo have a "second" page that shows all of the icons (you can get there by pressing the menu key form that front page).
The first five icons on the main menu screen are what appear as the five on your front page. You can arainge them from the main menu, but for the particular type of theme you have, you can't add any additional ones.
You can add different themes to your device, many have more "front page" options. Check out the link below, there are some excellent, creative themes out there to be had: Media Center - BlackBerryForums.com : Your Number One BlackBerry Community