Next, either nail, automatic nail, or screw in fence boards to the top and bottom rails in your fence panel as you would with any regular or traditional wood fence.
LEVEL AND PLUMB each board- Fasten top and then bottom on each board before moving to the next board. DO NOT fasten all top screws and then all bottom screws in the panel or the weight of the boards will tend to sag the top Rail.
Fasten the first board against the post into the top and bottom rail place the second board approximately 2-1/2" apart from the first. Make sure the board tops are level and in line not to mention plumb. Secure this board. Repeat previous steps to create a spaced panel on one side of the fence panel. Move to the other side of the fence, follow the same procedure. Depending on your spacing you may need to rip/cut a few boards to complete the panel.
Make sure that these boards are fairly level at the top with each other or the Fence will not look as level as it should.