Once you've listed all your tasks, you need to give them some context. For each task created you'll add the subject to which the task depends.

If you want to keep your task personal, then don't attach it to a subject and you'll be the only one able to see it (it will appear in light yellow).

Note: Tasks can be attached to multiple Subjects. So, if you want to implement GTD in Azendoo, you can create a Subject for each of my contexts (e.g. @office, @San Francisco…), a Subject for each of my Projects, Clients, Products, Meetings, etc, and then combine these Subjects as needed.