Where do I put this cable?

Hello, I'm building myself a new pc for the first time and currently putting in my new motherboard (GIGABYTE 970A-DS3P). Everything was going great until I got to these cables which I've got no idea where they're suppose to go. The one with 3 black plastic ends (one connected into the white one) lead from power supply and the white one is from the power switch button. Please excuse my zero knowledge about PC building like I've said building pc for the first time.

Any help would be appriciated

Yep.  Just molex power connectors.  They are used for all kinds of things.  IDE HDDs, extra fans, front panel power, whatever.  If you don't have anything that requires them, just tuck them away.

put them sowhere behind that drive tray, so you dont see them anymore lol.

If you have everything pluged in, all your sata drives have power and everything works. then you dont need that extra molex. floppy drive connector you dont need that either.

You put the white end into your AGP Video Card.

Its actually candy, for best results bite into cable while PC is at max load.

;)