You need to assign a name to each button and that name is what will show up as the label for each of the five hard buttons. At least that is what worked for me. On that sort of thing, I reload the original file that was loaded in my TSU9600 and see how they did something in it. That has answered a variety of questions for me.

Oh, one thing I've noticed is that all of the background they have provided are too big. If you use them, they'll cover up the labels for the hard buttons. (Putting the background on the system level page might fix this, but then every screen will hav the same background and what fun is that! ;-)