Find the notes, take the task, set Mao Mao as the first choice, and follow around. Go to Mars Mountain, there are some bubbles on the ground, and there is a note in one of them. Click the note. The second one is on the ocean floor, in the shell in the lower right corner. The third one is on the third floor of Helka Star. There is a stone beside the sea. Click it and a note will float in the sea.