To set up global default alerts for all users, go to Admin > Alerts. Here, you can select when alerts are to be sent for News, Resource, Custom Pages & Database modules. Note these only apply to users that didn't customize their own alert settings under their My Account section.
Further available options are “When Added”, “When Updated”, and "When Commented" as well as the frequency of alerts. The frequency options available are: hourly, daily, weekly and monthly.
*Note that the name given to modules, features and information items may vary in your platform as they can be customized by Main Admin users.