Well I hope he means how do you break in new pads as well, b/c you shouldn't be replacing the rotors and not replace the pads...
But what I do is get up to 30mph, lightly press the pedal until you stop, then drive around the parking lot without pressing the brake pedal for a minute or 2, then repeat the procedure again. I would do it at least 10 times. And that is just my opinion on the subject.
But if you do it like some people, where you don't drive around the parking lot w/o using the brakes, and just repeat the procedure back to back, you will smoke your pads.
Scott