OK so
In the Member holiday dates section, you can indicate your willingness/desire to find others to share a transfer with by adding your flight number to your subject. If you don't want to but still want to add your holiday dates, just continue as it is, just put your dates as your subject line...
Subject Line e.g. "11th October - 18th October TCX 443L" means you are holidaying and would be interested in sharing transfers
Subject Line e.g. "11th October - 18th October" means you are holidaying and would NOT be interested in sharing transfers
Let the chaos begin