For pedal installation, we recommend applying a small amount of grease to each pedals thread before installing. Next, take the right pedal (this should be indicated by an R on the pedal which can be seen on the end of the spindle or on the axle depending on the pedal) and thread into the drive side crank arm. Tighten by turning your 15mm pedal wrench to the right.
For the non-drive side (or left facing forward on bike) pedal, turn left to tighten.
Do not force a pedal that will not thread on easily or you can cross thread the crank arm which will result in a damaged product.