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How to replace my HP pavilion 751n power supply?

My power supply recently went out and I bought a new to install, but I am having trouble and need help on installing it. PLEASE HELP! My power supply has p5 p4 p6 on the wirings but I can't locate where to plug each one in. NEED HELP!

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1. First, open up the side of your computer. Then, unplug all the wires from your devices and motherboard (basically, trace all the wires coming from your PSU to everything else and unplug it). Then, on the outside of your computer, there should be 5-6 screws around the section of where you plug the power cable into your computer. Remove the screws. You should notice your PSU has gotten quite loose. Make sure you've removed all the screws (they should only be on the outside with the PSU sitting on a shelf inside your computer). Simply wiggle it loose and slide it out. Then, slide your new one in and replace the screws. Plug everything back in and you're set.