That question must be a joke! It is insulting to mermaids, as it suggest mermaids are idiots.
Idiotic statement 1 "I use linsey sterling's music usually for background music" [Translation, " I infringe Lindsey Sterling's copyrights"].
Idiotic statement 2 "when you claim that what you are using is someone else's and give details on who's it is, you are not liable to copyrights." [ And, when you rob a bank or murder 20 first graders, if you give details you did not commit a crime, right?]
You are banned because you are a thief stealing copyrighted material. Too bad if you rely on copyright infringement. Drug dealers rely on selling drugs, but few think it "terrible" if they get "banned" [locked up in prison].
You can't find "copyright infringement" in a search bar? You know "they have a form" for when you are accused of copyright infringement. Who the heck is "they" that have such a form? Facebook. Wow, you are a piece of work!
You need to swim on over to your local copyright lawyer and get your tail straightened out as your scales must be interfering with your mermaid brain. You are really one screwed up flipper lady. In fact, I wonder if you have flipped out. Perhaps a good copyright attorney can unflip you so you can swim straight and get your head out of the sand, legally speaking it seems for you it's in quicksand.
Or perhaps that was just a funny joke after all.
I am not your lawyer and you are not my client. Free advice here is without recourse and any reliance thereupon is at your sole risk. This is done without compensation as a free public service. I am licensed in IL, MO, TX and I am a Reg. Pat. Atty. so advice in any other jurisdiction is strictly general advice and should be confirmed with an attorney licensed in that jurisdiction.
I had no idea you could be a professional mermaid. Unfortunately your schooling on copyright law (via the MLA style manual, which relates to proper citation) has you floundering and confused as to the difference between copyright infringement and plagiarism. As my colleagues have pointed out, you are lucky to have slipped the hook and only been banned from uploading to Facebook as opposed to a copyright infringement suit, which may still be lurking in the shallows.
As an armature mermaid, you should consult a professional attorney to help you navigate the stormy seas of copyright law.