How to use the tasks settings:
Click the icon
at the right side of the menu bar. Select from the menu. Click on in the sidebar .
Change the settings.
Interval of the reminder in minutes. Specifies the preset time interval for the reminder of the task's due date.
E-Mail notification for Accept/Declined. Specifies whether you will receive an E-Mail notification if the following is true: A task in which you participate has been re-created, changed or deleted.