Need guidance on the forum post:

When a new event is created, I would like to have an email sent to all registered users (all groups). The Matukio setting for "Email on new event" under the Communications tab is set to Yes. The "New event email" is set to "Registered." The tool tip shows to select "0" for everyone but there is no zero to choose from the drop down list.

The emails are only going to one of my groups, and I need it to go to ALL groups. Where do I put "0" for everyone per the help notes?