Click/ tap on his User Name a box will come up. See highlighted bit that says start a conversation. Or , go to top right of screen where it says INBOX. Click/tap on there . Start a new conversation. Then add his user name.
Many thanks for explaining that I'm sure the message has gone now, plus the message of how to send one
I'm happy that it was helpful. I've no idea why the "Start a Conversation" button on that screen isn't simply labelled "Send Message" as I think it would make more sense.
Can everyone please PM Clive. Just to make sure the system is working. You and me both. You should see the admin settings... Counter-intuitive an immense understatement.