Reference Photo
Your stand fully assembled
First thing to do is put the rods in the base. Watch this 2 minute video and it'll show how to do it correctly.
There is a "front" to the stand. The (2) 4" rods face front and are 14" apart. See the picture below for the placement of the rest.
Next, slide the spacers onto the rods.
After the spacers are all on, notice that a little bit of the rod is sticking above them? This is where the top pieces will screw on to. Refer back to the video to make sure you don't put the tops on upside down. This is where 99% of assembly issues occur.
The tall center post uses the (2) 10 inch rounds. The one with the hole (no tnut) goes on first. Put a 4" spacer on top of it, then the other 10" piece with the tnut screws onto the end of the rod like the others.
Finish the other tops and you are done.