Okay, this is a small guide on how to put profile music on your page. This is the way I do it, and there are probably a ****ton of other ways to do it too.
Step 1) Sign up for puush.me.
Step 2) Upload the .mp3 file that you want to use. (not sure if other types of music files work)
Step 3) Once it finishes uploading, go to the URL and copy it.
Step 4) On MabiNation, go to your settings, find General Settings (on the left side of the page, near the middle-ish), and then scroll all the way to the bottom. In a text box there, paste the URL you copied, and then save changes or w/e.
Step 5) Cross your fingers and go to your own profile to see if you have profile music now.