How do I contact him? I have tried to send a message but no message seem to appear in the "Sent messages"
From the forum Settings options, select General Settings

In the Sent Private Messages section, select Save a copy of sent messages in my Sent Items folder by default

Other categories and options in the General Settings section:
  • Login & Privacy
  • Messaging & Notification
  • Private Messaging
  • Visitor Messaging
  • Thread Display Options
  • Date & Time Options
  • Miscellaneous Options