I want to know how to make forums for my sight but make me be able to lock any thread I need to (cussing/offensive language) and be able to make and lock my threads, how do I do that?

Hey, creating your own forum coding it yourself would need to be done in php and GCI - i think; you don't have to, there are phpbb and loads more.. Which can do all the things you said. Either look on your cpanel or search google for one :)

You can't have HTML forums, well not just HTML anyway, Phill was sort of right, it can be done in PHP, CGI, ASP, along with the database languages MySQL, SQLite, MSACCESS, MSSQL, etc. Your best bet is to go with phpbb, it is free and really easy to use:

http://www.phpbb.com/

Good luck ;D