What's the charset of this forum?

http://heocon.com

Cause whean I post, all code, for example: [b ]
appears like [b ] (doesnt read the code)

what can I do?

[b ] has nothing to do with the charset usually.

Do they support bold tag? Does it work normally manually? Could you give a link to message where [b ] is not showing properly?

Edit: no response in 20 days. They don't seem to allow [b] tag. There is no [b] tag in manual posting. Report this to that forum's admin, or just read their rules, they probably banned the [b] tag.