|"I read those pages 5 times. Wishing for more information"|
I believe if you had looked closely & compared the 4-pin plug to the 8-pin connector you'd find that they're both keyed & can only be plugged together one possible way.
Here's a close-up of the 4-pin ATX12V plug...notice that two pins are square & two have angled corners:
Now look at the 8-pin EPS12V connector:
It should be obvious which way the clip on the plug should go, so it's just a matter of connecting the plug to the 4-pins on one end of the 8-pin connector or the 4-pins on the other. And because of the way the pins are shaped, one end will work, the other will not...you can't do it wrong unless you really force it.