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I feel like I need a tutorial because I cannot get it to draw anything

I was confused too, but I'm stubborn, eventually figured out:

Clicking "Draw Fast" creates a box with the label "a city skyline"—drawing in that box will render an image to the right as you draw.

Double-clicking the box that "Draw Fast" produces allows you to edit the tag which says "city skyline" by default—allowing you to change what it renders as you sketch.

And can you copy and/or save the generated image?

I can't seem to find an explicit save or export option apart from File > Print. Using that, the Chrome print dialog, "More Settings" allows it to be opened in Preview or "Print Using System Dialog" where it can be saved to PDF.

Alternatively, I just screen captured the rendered image with MacOs "copy selected region to clipboard" command.

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