I need some help my new computer

[Native gamer33]

I bought a new hp pavilion 500-164 desktop and I wanted to game on it so the geek squad dude from best buy recommend I buy pny gtx 650 graphics card but when I got home, I plugged the graphics card in the slot in mother board but I don't know whre to plug in the molex cord in the power supply or whatever.

 

[Rohit G Nair]

See the instruction manual of both gpu and psu.