i really need help fast

well i was driving and i got that knocking sound when i turn so im thinking
its the half shaft or cv boots right..well i dont know id=f it is that casue i was sitting there and turning my steering wheel and it mad the sound like it needs power steering fluid..well thats easy right..lol nope how do i change or fill power steering fluid..i mean i cant tell where to drain it and i dont know what it looks like...it sounds dumb but hey i need help.....if anybody could give me a pic or a site for my car to fill it let me know.....

I had a little poppin sound like that and it was the drive shaft. sounds like something plucking a steel cable, but the cable is very tight and it's a quick popping sound like three or four pops depending on how tight a corner your turning.