Swing is delaying the E and A of each beat or on the second and fourth sixteenth note of each beat. You can find it on pretty much every drum machine out there, also known as the 'Shuffle' feature. It's used to add more feeling or depth to your percussion.
next time ur in FL... lay just one track in the step sequencer with a hi hat... fill each or those little squares up so that there all hitting one after another....hit play and then move the shuffle slider over a little by little... you should start to notice the "swing" effect, it just gives it more of a groovy feel.