Click mode of attack. To see the baby penguin's attacks click the baby penguin's attacks button. In order to go back, click the scratch cat's attacks button. If you want to use the combo move, then type two attacks, one from scratch cat and one from the baby penguin.
Check out the others from this series 1. https://scratch.mit.edu/projects/770712150 2. https://scratch.mit.edu/projects/662286048 3. https://scratch.mit.edu/projects/705722990