Arrow keys to walk. Click on Den entrances and exits to leave and enter. Click on one of the nests in every Den, depending on your rank, to sleep. If you are a warrior, it'll be in the second part of the warriors' Den. Press the arrows to travel between places unaccessible by foot. Talk to the little cat beside Highrock to see your stats. (HP and ß) ß is a form of currency you can earn by doing tasks like picking ticks off of the elders.
When it is night time, you will hear different music. When you wake up again, you will hear different music again and then the regular music will play again.