You need the number of the message you want to link to first of all - mouse over the quote link and note the last number (quote=xxxx)

Then the syntax is the one used by the ebots to take you to the latest post.

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=xxxx&ebot_calc_page#message_xxxx

• where xxxx is the number you got from the quote link. It seems you need them both, unless I missed something.