Using this water doodle book is easy. First, fill the water pen with water. Then, start coloring within the lines of the farm animal pictures. As you draw with the water, the colors will appear, creating a fun and educational experience. Remember to keep the water pen clean after each use. Let it dry thoroughly before storing it. Also, make sure to keep the book away from direct sunlight for long periods to prevent the paper from fading. This book is for kids aged 3 and up, so adult supervision might be needed for younger children.