I would really like to know how to edit/delete posts in the chatbox... because alot of people are posting inappropriate things there ... and some sort of moderation for the chatbox would be great ....
i'm still somewhat new to all of this, so i could be off. i'm sure someone will correct me if i'm totally wrong... but i don't think you can do what you describe. you might be able to modify some of the php to do it, assuming you want to dig into that much.
the chatbox mods just stuff chat entries into a database, and show some configurable number of messages in the window. so as i mentioned before... you can delete the entries from the actual database, but making sure the browsers can be refreshed to show the reduced amount of messages is another matter.
if people are abusing your chatbox, then maybe keep chats disabled unless you are hosting an official chat. i'm thinking of doing the same thing on my ChatBox---not because people are abusing it, but because conversations are disjointed if left open all the time...