When a task is triggered manually in the Admin app or via a sensor rule, you will be notified via the Insight app that a task has been triggered, and there you can manage the assigned task.
When a new task arrives you will be notified by a "New task" (1) event in the machine time line. By clicking on the task tile the task detail page is shown where you can manage the task. Also the number of "Tasks To Do" (2) increases. When a task is created by a threshold rule and the notification setting is on, the sent notification can be found at the top of the page (3).
You can change the status of a tasks by clicking on the 
icon in the Status changes tile. Select from the "Change status" (4) menu the status in which you want to put the task. For example, when you start with a task you change the status to "In Progress".
It is also possible to assign the task to another person in the team (5) or to change the start and/or end time (6).