It is a small circular brown button on each of the farms. Rigth next to the generation bar. If you still dont see it, maybe you could send me a screenshot on discord?
okay I see it now. damn that wasnt obviou as a button as somethign at all, looked like part of the actual frame, would have never considered clicking on it if you hadnt mentioned it. I msut have skipped the part in the tutorial where it was mentioned :-)
