Poirot - when you get an e-mail notifying you of new messages, just click on the link in the e-mail and it will take you to the appropriate post. If it is a personal message, when you go to Rootschat you will get a message saying something like "You have a personal message, do you want to open it now". If you say yes, then it will take you to PMs, if you say no, then you will need to go to My messages on the bar just underneath the Rootschat picture, and click on that.
Lizzie