When you are posting your message, click the "http://" button above the message window when you get to where you want your link to appear. This will open a dialogue box which asks for the Script prompt (the text you want to appear), and after you fill that in, another box appears asking for the URL. You paste in the URL and "Wallah!".
Example:
Rarly8's website
Good luck and remember: "To err is human, but it takes a computer to really f**k things up!"
TT