If you entered a valid E-mail address, you should be able to get the forum to send you a password reminder.
for the future, it's probably a good idea to have a password you can remember, sinse too many name changes here could get a tad confusing (and your already on your second).
I personally have a set of passwords which I can remember, a symple one which I use on web forums and online games, a slightly more complex one for more serious occasions, and a monstrously long complicated variation which I use on things like Paypal and my bank account. It does nnevertheless mean something to me though.
One I used to use for example was ashnaz3791, the Mordor speech for "one ring" followed by the numbers from the rhyme, ---- three rings for the elven kings etc, that way i could remember it.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)