As a requestor, you create a request, and you add tasks to the Task Container. The next step is to submit the tasks and once submitted, the tasks become available for the analyst selection.
As an analyst, you can either create an experiment or use an existing experiment and add the Tasks to do information item from the Add Content button. Once the Tasks to do information item is added, it allows you to select and add tasks to the Tasks to do table.
This is detailed in our training video: Tasks and Requests. You can also refer the contents from Help Centre > Signals Notebook > Tasks and Requests