Press the green flag, and click the monkey. Try out the banana, the drum and the drink at the bottom. He'll get more hungry, thirsty and bored. I've just started Scratch, so you'll have to press the green flag to make him less thirsty, hungry and bored. Sorry! But this is a great game for kids, and very simple and easy. Enjoy!!!
And by the way, if every status is already 100, don't press any of the toys and stuff.