Indeed the requirement to become a moderator a set rather high. A person must be a long-standing and active member.
Also when it comes to editing posts, this is handled very restrictively (if at all). Unlike Stackoverflow, where another person may completely rephrase your question (for better English), we mainly target spam, and abusive posts.
It would be ok to add code tags to some ones post. Though it is rarely done.
It is possible for everyone to reply to existing posts (public or pm), and tell users how to add the code tags. Users can edit their own posts.
Still appreciate your willingness to help. You could look at our wiki. As a wiki it is open to everyone for editing.