hi!!! if your problem is that the mp3 isn't showing up on your profile, try this:
for example, i'm using the song "i want you back" by *nsync, and the youtube link for the song's official video. first things first, copy the mp3's full entire code and delete these sentences: "-- (delete these parts) put this code in the "heroes" section of your profile --" and "-- put THIS code where ever your style code is --".
then, in this section: <iframe allowfullscreen="" src="https://www.youtube.com/embed/[REPLACE WITH ONLY YOUTUBE VIDEO ID]//?&;amp;;autoplay=1" loading="lazy" width="560" height="315" frameborder="0"></iframe>
delete "[REPLACE WITH ONLY YOUTUBE VIDEO ID]" and the brackets ("[]") too. there, write only the id of your song's link. in my case, the link is "https://www.youtube.com/watch?v=is6gtilerPk&list=RDis6gtilerPk&start_radio=1", therefore i only have to write "is6gtilerPk" (the code between "/watch?v=" and "&list=").
then, here: <span class="song">[SONG]</span> and here: <span class="artist">[ARTIST]</span>
delete "[SONG]" and "[ARTIST]" and write your song's name and artist(s).
Check out my other reply down below!!!!!!