Settings

The 'Settings' option lets you choose which types of tickets you want to be notified about.

To access the settings screen, click the action menu at top-right then click 'Settings':

The 'Notifications' screen opens: 

 
You can choose whether you want to receive notifications about 'New Ticket Assignment', 'New unassigned ticket', 'Reply or response on ticket', 'Ticket closure', 'Ticket state change' - 'Overdue / Notdue', 'Answered/Unanswered' and 'Ticket update'.

All notifications are selected by default. Enable 'Send only for my tickets' if you only want to receive notifications about your own ticket.