Working with the Frame Generator - Autodesk Inventor 2010: No Experience Required - page 228

14. Pick the points at either end of the top edge, as shown in Figure 5.12.
You may need to change the Orientation angle value.
FIGURE 5.12 Placing the last frame member
15. Click OK to place the last member and close the dialog box.
16. Right-click the frame envelope component in the Browser, and turn
off Visibility.
17. Compare your screen to Figure 5.13.
18. Save your work.
FIGURE 5.13 The frame members in need of editing to complete the model