Hi Keith,
You could just create a template file with Notepad with the text you have in your post. Save this file on the desktop (Or anywhere that suits.) When you are ready to post a message first open this text document, highlight all of it. (Put the curser at the start of the file, hold the left mouse key down and drag the curser to the end of the text and release the mouse key.) Now press control C on the keyboard. (This copies it to the past buffer.) Now put the curser in the post message box and press control V. This will put a copy of the template in the message box. Then just type the rest of the message.
Les.