I see "Every AI page is drawn already. To change one, open it, write a new idea in the box above the page that says what it shows, and press “Draw again”. For more ideas, add pages."

Every AI page already has its picture, so there is nothing left to plan. To change a drawn page, type a new idea in its toolbar and click "Draw again" (one more picture on your key). To get new ideas, raise the number of designs first.