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On the Mercurial Overview page at https://netbeans.org/community/sources/hg.html the section "Authenticated Push Access" needs a short example of how to login or other modification. This is because the text says that "you enter your username and a non-blank password". THIS IS INCORRECT, and Mercurial will reject it! For a push (e.g to contrib), you must enter your NetBeans email address, i.e. user123@netbeans.org and a password!
Perhaps a reference to http://wiki.netbeans.org/HgHowTos would also be useful...