One think I don't know
Ahem.... Spellcheck!
where do you find topic and forum number?
In the address bar. Towards the right side, you can see f=, t= and an m=. These represent the forum, thread and message numebers, respectively.
Just make sure that the address is for the message that you want to link too. You might have to click on the actual message, like from the one it was replied too, to get the address to point to that message.