Due to chain rattle I went about adjusting the front derailleur, the L and H screws, etc. At some point I disconnected the cable, and I can't get it back on properly so that I can effectively change gears. I have to push the lever in far too much to get to second and it's impossible to get to third. Also, my tension adjusters don't seem to do anything, even after turning them almost all the way out. I feel like I've watched every video but they don't go into enough depth regarding the proper way to put on the wire.

P.S. Brand new bike and I'm a newb using the internet trying to teach myself this stuff. Thanks.