You can't change the video after it has been uploaded, AFAIK. All you can do is replace the audio with one of YouTube's pre-approved songs/soundtracks. Maybe someone else knows more about this, but I don't see it in the editor in the current version of Creator Studio.
You should research the loudness level that YouTube typically normalizes to (~-14dB LUFS), though certain kinds of content (e.g. voiceover/podcasts) will want to get mixed/mastered to lower levels, that is the level I use for music.
"... I know in the mornin' that it's gonna be good
when I stick out my elbows and they don't bump wood." - Bill Kirchen
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