Its a long time since I learned but I'll do my best. On a reach, start to turn away from the kite so that you increase force on yourself and the buggy and you almost start to slide. At this point transfer your weight to the kite side, and press down on the footpeg nearest the kite, whilst lifting the one away from it (easiest if you have footstraps) a little dive of the kite into the power zone will also help get you up.
Basically you then need to balance the varying force of the kite with slight steering changes.
Steve.