To construct the angle bisector after labeling the intersections of the arc with the sides of the angle as points P and R, the next step is:
Option #2: Place the pointed end of the compass on point P and draw another arc inside the first arc and between the two sides of the angle.
This step involves creating a new arc that intersects the previously drawn arc, which will help in finding the point where the angle bisector will pass through. After drawing the new arc from point P, you would then repeat the same process from point R, creating another arc that intersects the first new arc. The intersection of these two arcs will help you determine the direction of the angle bisector.