Did you forget your password? If you go the login screen here:
then there is a handy " I forgot my password link" which requires your username and your email address.
of course, you might have forgotten your username as well ...
If it is as a result of a notification over a PM received in your forum "mailbox", then luckily the notification will begin with something like " Hello john.nash, "
In my case john.nash is my username; obviously yours is different.
I do not personally send out notifications (otherwise I'd do nothing all day but that and I'd not have job and be out on the streets quite quickly). They are all generated by the forum.
If you have forgotten both your username and email address, then I guess you need to email me and I''ll spend 10 minutes searching through the forum list and resetting it for you.
You are able to edit your own profile, including changing your own password. You do need to be logged in first, however.
You go into your own "user control panel" - the link is top left. YOu can also set a signature (the bits that appear at the end of every forum post) and avatar (the image under your name)
More information on avatars here; viewtopic.php?f=35&t=39