How do I lighten a movie..?

This is new to me. How much detail do I need to include in a message or question? I copied a movie and it came out too dark. I saw the same movie that someone had used some ligtening techniques - very much like what’s used to lighten photos. I just don’t know what was used or how to use the tools that I have to do the same.

By the way, the time here is now 3:42 AM.