You can connect all of your case fans to the molex connectors from the power supply. You can even create an adapter if needed by cutting up an old molex power splitter or extender. The board was not made to attach any case fans.
If you do need to direct wire your fan to a cut up adapter, check the fan voltage. If 5V use the red wire (+5V) and black wire (ground), if the fan is 12V use the yellow wire (+12V) and black wire (ground). Do not cut up one of the PSU Molex cables, always use a splitter of extender for those kinds of mods.