It is possible to ask the WIKI to send a temporary password for the email adress you have given when you first inscribed yourself. In order to do so, follow the steps:
Click in the Log in button (left, above)
In the page that downloads, click on I FORGOT MY PASSWORD (right side of the password field)
In the page that downloads, fill in the USER NAME and click on FORGOT PASSWORD. A notification will appear to tell you that a new password has been sent to the email address that is registered under your user name.
After checking your email, copy the temporary password sent by the WIKI and re-do the Login using the new password. After logging in, you can change the password and personalize it once more.