• A task for a document is created.
  • A document is open for view.
  1. On the right pane, go to the Tasks tab.
  1. Select the task.
  1. Select Edit.
  1. Select a place in the document to which you want to link a task.
  1. On the right pane, select Save.

You can change the appearance of the markup with different colors, stamp shapes etc. For that, use the toolbar at the top of the document area.