you will need to log in a second time if you want to edit a Waze wiki. Look for the second "log in" directly under the main Waze "login" link in the upper right corner of the webpage. Use your standard user and password for the 2nd log in.
My password will not work for the wiki login page. I get the error:
Login error: Incorrect password entered. Please try again.
Using a bad username gives a username error, so I know it's a problem with the password.
I don't know if it's related, but I noticed that some of the wiki help links pointed to http://www.mediawiki.org. I tried logging in there to see if you use their account management because they have a reset password option. I also get errors that indicate the username is good, but the password is bad. When I tried the password reset option I received the error:
The username $1 is not registered on this wiki, but it does exist in the unified login system.
I tried to create an account on their site, but got a similar error (don't have the exact error and am too lazy to try and create the account again.)