How the hell do you add music to profile

I read the whole damn profile thing nothing on music so, How do you add music I want to add a song.

HTML I guess?

Yeah but where am i supposed to find that? I have no idea where to satrt and the internet is after all a huge place.

If you do a google search for "profile music codes" or something along those lines a bunch of sites will show up that let you embed an HTML code directly into your profile

Here's a couple:
https://www.hotcodez.com/
https://www.singingfool.com/home.asp

This has been asked/explained a few times on TFS already:
https://www.theforumsite.com/forum/topic/Can-I-/107340
https://www.theforumsite.com/forum.php?t=90019
https://www.theforumsite.com/forum/topic/What-is-the-easiest-way-to-download-music-to-your-profile-/102901