Videos on youtube don't help because the inside of my computer is different. I was able to put in the 500w power supply that I brought but the card wasn't working out. It's weird cause like in the other videos you could just slide up the part that im having trouble with but you can't do that with mine. But it's not like solid and theres some kind of piece there...

If anyone wants to look at the computer and help me out, it's called a ET1831-07. It's an emachines and the card I brought is a galaxy gtx 460. Card is huge :3.