How do I delete my old messages on BHW?

Hello, so I logged back to my account with the intention to delete all my previous topics and messages in this forum, but it seems that I don't have the option to do it.
How can I delete my topics and messages here? Do I have to contact a mod? If so, how? There doesn't seem to be a specialized section in the forum for this type of request.

Thank you in advance.

Please contact support for that.