To send a private message (PM) on the website, users need to click the "Start a Conversation" button located in the editor page or under the "Information" section of a user's profile. There is no traditional "send" button; instead, initiating a conversation serves this purpose. Users can check their sent messages in the "Inbox" to confirm that the message has been sent. The process is straightforward once users locate the correct buttons. Understanding these features enhances user communication on the platform.