Can't interact with a piece created.

Hello Everyone,
I'm working on a design for a weight cuff in my class on the AUTOCAD program in my high school, I created the main portion of it and now cannot interact with it to export it as a .stl file in order to print for our first test. If Anyone could please help me out in any way I will be very appreciative.

Thank you very much for your time in advance,

Ian

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Image may be NSFW.
Clik here to view.