STEP ONE: Determine proper bracket placement 
Fig A
1) Find the factory holes that are in the frame, this is were the first two brackets will be bolted to the frame equally spaced using 8mm bolts. tighten the bolts to hold up the brackets.
2) The third bracket mounts on the frame were the frame slops up towards the bottom of the vehicle, there is already a hole in the frame but will need to be drilled out using a 25/64" bit. (Fig D) 
3) Next insert a Teri-wai in the hole you just drilled, with a 6mm bolt and 1/4" flat washer thread bolt through bolt into Teri-wai. (Fig D)
4) Do this with all brackets putting them in their proper places.

STEP TWO: Attaching "L" strap to bracket and vehicle
1) Place the running board on the brackets with the support
Bolts falling thru the slots in the foot of the bracket
2) Find the factory holes that are next to the pinch weld, The strap bolts to the side of the bracket then to the vehicle using the 8mm bolts. (Fig B)
3) Slide board in or out to desired location
4) Tighten down flange nuts under running board.

STEP THREE: Installing the third strap to vehicle (Fig D)
1) The third strap screws into the rocker panel using a tec screw.
2) Do this with all brackets on both sides of the vehicle.
3) Check that all brackets are tight before stepping on boards.