There's no on/off button either. When plugged in this Krup machine lights up with one of its two buttons. I spooned in batter.
Apparently, I made two mistakes. First the machine was too cold; there's a second light which indicates that it's hot enough. And second, I spooned in too much batter. The result was a disgusting mess, which I, rather wisely I admit, decided to throw in the garbage.
Eventually, I got it right, and the waffles weren't bad.