Within the elements that you wish to add tasks to, users with edit/manage access can add a Checklist/tasks area (or multiple checklist/tasks areas). They can do this by clicking on the “add content areas” action button (“+”) in the builder action button panel and selecting “Checklist/tasks area”.
Like all other content areas, they can then be placed (using the blue drag-drop action button) in any position.
You can also can add tasks manually or import from outside of the platform. You can also add existing checklist/tasks from others items by clicking on the add existing button which will prompt an off-canvas window to appear on the right, which you can scroll through or search for the required Checklist/Tasks to import.
For further information on adding Checklist/tasks areas, please refer to these articles: