Goto the Randomizer login page below the amount of time you would like to stay logged in box theres a link that says "Forgot your password?" click it.
Once clicked it will take you to a page which will ask you for information and then a security code. Enter the information required and press "Submit" only once. Clicking it again will probably cause an error.
The Password will then be sent to the email on file for you.
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If this doesn't work, make a new thread in this board.
PS: in future try not to lose your password. If you use a hard password it might be a good idea to write it down on a piece of paper but don't leave it near your computer place it in a safe place you will remember.