To receive alerts you just have to search for something in Trovit. Once you have done that, in the search results page you will have the option to create an email alert for that specific search. You can also create alerts from the myTrovit section of our service.
Please, consider that it is a relatively common mistake to mistake push notifications for alerts. While alerts are emails sent to your inbox, push notifications warn you when there are new ads that match your criteria. Alerts get stored in your inbox while push notifications are not saved anywhere.