This feature allows you to require the presence of one or more elements for the test to run. To apply this: select an element in the WYSIWYG editor, and then in the contextual menu, click on “Add to targeting”
When you click on "Add to targeting", a confirmation window pops up to tell you that the element has been added.
If you wish to delete an element that has been added to the targeting, go to the "Target test" menu option. The window that appears contains all the targeted elements. Just delete the one or ones you wish to cancel by clicking on the X button.