To have a message you have posted modified or deleted, go to the board where you posted the message and look for the link near the bottom of the page to the board administrator's e-mail address. Send an e-mail explaining the changes or deletions that need to be made making certain to tell the administrator exactly which board the message is posted on.
Many administrators have quite a few boards.
You can also notify the board administrator to make the change for you just as you would to otherwise modify or delete your message. Please include your new and old e-mail addresses, the subject of the message, the date the message was originally posted, and of course, the board on which the message is located. The board administrator's e-mail address is at the bottom of each board with a clickable link. The list of your board posts can only be sent to the e-mail address used in the messages. Your list cannot be forwarded to a new, or different, address.