First, generate a data-set by clicking on the left and right buttons in the main window of the applet. Then, press "split" to split the data into training and test sets. Then you will be able to press "step" for a single boosting iteration, or "10 steps" for executing 10 steps at a time (most of the calculation time of the applet is spent updating the graphics, so in this way you can save a lot of
