Click the piece that looks like a lower-case letter t.  It has a square on top and a triangle tail on the bottom right.  Do not touch anything else
page3-86.png page3-131.png page9-30.png page8-38.png page6-123.png
page1-27.png page4-25.png page3-193.png page5-152.png page7-56.png page8-38.png page3-131.png page6-123.png page3-86.png page9-30.png
That is completely wrong.  De-select it and do not touch anything else!