Follow your instructor's directions of course.
I always teach new students to "pitch for airspeed, power for glidepath"- if the airplane gets slow on final, then pitch the nose down or visa-versa; if you are too low to the proper glidepath then you can remedy it by adding power a little bit which will raise the nose a little as well. If you are too fast for the airplane to settle and land at first, don't try and force it down, just glide along with the power out until it slows down, then it will settle. Try and maintain directional control on the runway using your rudders and brakes of course, but do not forget that almost as much directional control after a roundout comes from proper aileron position. Just remember, "aileron into the wind". Have fun.