How to use this forum ?

[Vinod K Chandran via Digitalmars-d-learn]

Hi all,
I have some questions about this forum.
1. How to edit a post ?
2. How to edit a reply ?
3. How to add some code(mostly D code) in posts & replies.
4. How to add an image in posts & replies.
5. Is there a feature to mark my post as "[SOLVED]" ?