Alan: I'm not sure I completely understand what you're having problems with?
But, at the point you're talking about, you are asked to draw the panels of the tree.
As you can see by the attached image, I've used the Shape Tool, to draw 4 points to make a panel.
The two star shapes, at this point, are used to give perspective to the panels.
Are you saying that you cannot select the 'Shape tool' or the 'Pen tool', to draw the panels?
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