How do I incorporate text entry boxes into a quiz?

Hi Everyone,

I am very new to Captivate 8. I am trying to incorporate TEB's into a quiz. When I try to check the button (include in quiz) it is grey and does not allow me to check it. In addition I do not know how to let the programme know what text I would consider correct or incorrect after the student has typed it into the text boxes.

I am obviously missing something and would be very grateful for help because I am losing my patience ++ (all the videos on the web regarding this do not appear to be for captivate 8, only earlier versions :-()

Thanks

Alex