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

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

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

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