um, i wrote a harry potter rap. is there somewhere on here i can post it?

You can make it into a youtube video then emble the exact thing in the box (ex.link) (the last number is fake so don't click on this) or...
If you have it on a (safe) website then you can put a link to it in the links section.

(Interesting, clicking on the link brings you to respostas that need help as well as answered questions..., cool)

You can always post it as an article. That's what I would do.