if youre not comfortable with pulling molex connectors on the PSU apart grab something like
this molex y adapter and cut the molex connectors off the end, splice the wires to the fans. the yellow wire to the molex is 12v, so that would go to the fans red (probably red anyway) wire. then black to black. you can run all 4 off one yellow and one black if you want, or 2 on each.
link to the fans and I can walk you through it.