Start off by prepping the mounting plate. Insert the #6-32 nuts into the plate grooves. They should have a tight fit, you can use your thumb or the handle of the screwdriver to pop each one into place. The nuts will secure the screws that will hold the railing platform to the fluid video head.
You will need a 1/4''-20 male thread to attach the plate to the fluid video head.
If your video head has a smaller thread you can use a 1/4" to 3/8" converter.