To go up push the up arrow, down is the down arrow, left is the left arrow, and right is the right arrow. Try to eat the fish by walking over to it. There are two fish. One is at the beach and one in the pool. The fish will automatically reappear when you eat them. To go to other places, just walk over and get in the teleporter. Then walk out and you'll go the backround you were at.
Special thanks to my older brother, who helped me figure out how to make the fish appear and disappear.