double click it so the border turns Orange.
now use the View direction buttons to get you into a view you want to tilt around, this is important because if you are viewing from any arbitrary direction, the tilt might not apply the way you want.
then hover the mouse around the edge of your part until you see the mouse go from Cross Hairs, to a nearly full Arrow Circle. click, hold, and drag the mouse to tilt the part.
if this isn't clear go up to the Tilt Part in Blank feature look down where it indicates maximum Angle or Blank height, pick Blank height, then click Minimize. Hyperdent should automatically compensate for blank height.
before calculating, double check any margin directions and Screw Channel directions.