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Click once on the XYPlane button, .  Next, click once on the royal blue Z vector (displayed below) which should be in the bottom right section of the Design Modeler window. Image Added
Now, you should be looking directly at the XY plane and the axises in the bottom right corner should be oriented as they are in the image below.

 
Click once on the "Sketching" Tab which appears at the bottom of the Tree Outline.
Click once on "Line" in the "Draw" tab that automatically appears. Then place the mouse cursor directly over the origin of the XY plane unit a P appears.  Once the P appears then click once on the mouse. Next, move the mouse over to the right so it lies somewhere on the positive x axis.  Prior, to clicking again make sure that a C appears. You should now have a line that starts a the origin and terminates somewhere on the positive axis.

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