Click on the "Join Our Group" button. Type whatever you like about MetaKnight and bingo.
To submit artwork
a) To submit new artwork, click "Submit Art" in the blue banner above or check the checkbox on your normal "Submit Art" page.
b) To submit already posted artwork, click "Submit to a Group" on your deviation, right of the description.
The comment box is for comments. For ongoing conversation with other members, we also have a chatroom here.