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So I just shove the red wire from fan into yellow in connectors and black in to black in connector... what what about the yellow in fan? what do I do with it? And which black wire hole in the molex connector do i put the black wire from fan in, cuz there are 2 in molex connector.. >>
The yellow fan wire doesn't go anywhere. You don't need it for the fan to function anyway. And use any black wire on the molex, they're both ground...
Keep in mind this is the cheapest, grungiest way to do it. It works, but it looks a bit silly. If you want to do a better job, go with a tail or try the soldering method.