emailalerts in plugins

I have a Latest News on a site. If I place a news item on the site I want all registered people to receive an email. So that's why I think J!MailAlerts is a good option.
I installed it but when I search in the plugins for 'emailalerts' (see c. Install & Configure Individual Alert plugins' I cannot find them. I don't now how to configure this when they aren't available in the Plugins?