Most forum User Controls have a place where one might find all of the users posts and I Find that. If this doesn't exist then I suggest this very much!
Click on your username on the left where you posted a message > it'll take you to your profile > in the bottom left of your profile, click on: Access to the whole list of his/her messages
Note: I guess clicking on "See My Threads" does the samething. You can find it at the top with the blue flag.