You go to Just Dance Wiki:Apply for Staff and put your name down under requests. Also btw, you already are part of staff, because you are a moderator. However, if you want more, that's the way to do it.
I see you make lots of discussion related edits! Would you like to be a chat moderator/discussions moderator? If you get those rights, you can ban users from chat, delete comments on threads an articles, etc.