How do I draw on Fire Alpaca?

When I open the drawing program Fire Alpaca, it just shows me a grey screen and I cant draw anywhere. I can put images on the program and erase parts

When I open the drawing program Fire Alpaca, it just shows me a grey screen and I can't draw anywhere. I can put images on the program and erase parts of that image, but that's it. What do I do?

or:When I open the drawing program Fire Alpaca, it just shows me a grey screen and I can't draw anywhere. I can put images on the program and erase parts of that image, but that's it. What do I do?

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