Originally Posted by
IamDannyphantom
....I had to replace my rear derailer, and ever since then I haven't been able to shift my gears properly, I've tried taking them off and redoing it, adjusting the two screws for the gears, .....
based on this part of the post, I suspect the real issue is that the OP doesn't understand how derailleurs work, and how to set up and adjust.
This is why I listed some key points, then sent him to review tutorials.