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

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

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

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