Tasks can be added to the following nodes: activities, decisions, events and process links (process link tasks represents the underlying activities of that process).
Tasks are listed a,b,c under the node title.
Quick Steps
Click on the controls icon next to the activity:

Click Add Task.
Enter the task details.
If additional tasks need to be added click on the +
Or use the Alt-T keyboard shortcut.
Add all necessary tasks.
Once all tasks have been added, click Add Tasks.
The tasks will appear listed below the activity in the diagram content.
To reposition a task within an activity:
In the right-hand side diagram content menu, procedural steps:
Grab the three dots icon that appears in front of the task to drag and drop the item to a new position
To delete a task, click on the gear icon next to it, and select delete.
To edit a task, click on the gear icon next to it, and select edit.

