Under user preferences, select the Notification tab.
In the box to determine how to be notified of different items, there are no selection options. Nothing is clickable.
Update 2018-06-20
Still failing.
When you select the link “Set an email address” you can see it is red and leads to the following error:
The link to that missing special page is:
https://wazeopedia.waze.com/wiki/USA/index.php?title=Special:ChangeEmail&returnto=Special%3APreferences%23mw-prefsection-echo