Start by inserting the backset
(latch) into the door with the rounded edge facing the latch hole. You may need to tap it slightly with a hammer to get it to seat properly. The door may already have a mortise
for a face plate on the latch. If it does, use the 3/4" screws to secure the latch to the door. Also, be sure to adjust the latch for the backset depth. Interior doors are normally 2-3/8" and exterior doors are normally 2-3/4" depth. Check the instructions that came with the knob on how to adjust the backset size. Most knobs now have adjustable backset to accommodate both sizes.
Once the latch is in and secured, it's time to insert the knob through the backset and screw it together. Be sure to insert the stem from the handle correctly into the latch. This is vital to proper operation of the knob. Now that everything is aligned and the knob is fitted against the door, screw it together with the screws provided. Be careful not to over tighten the screws as this can hamper the operation of the knob.