I can't water the berries; I can only plant them. I can click on the watering can and berries, but nothing happens. Do I water them right after I plant them? Is there a certain time I have to water them?
You can't water a berry right after you plant it; it kind of "waters itself" at that moment. That's why the soil is dark: because it's already moist. As time passes, the soil's color becomes lighter, and that means it's drying. Then you can water the berry. If you plant a berry and check the next day, you'll probably notice it's dryer, and will be able to water it (unless the plant's fully grown).