Tasks can be triggered both in the Web and mobile app. First the task templates need to be set up, this is described here.
Click the 'Tasks' option in the machine menu. On the Task page, click on the Task template menu via the options menu, and choose 'Trigger manually':
A dialog will popup where you can select the assignee and expected start date & time and end date & time:
From the Task page of a particular machine, click on the options menu in the right top corner and click 'Manually trigger tasks'. The list of defined task templates is then displayed. Choose the task template you need:
(This function will be part of future release of innius 1.9) Then in the next screen you select the assignee and expected start date & time and end date & time:
See also the article 'How do I work with machine tasks?'