I am not sure I understand. You have the pets in an active team and can't choose which skills you want them to use? What arrows?
Just to see if this would work, I am adding a link to a picture showing how to swap a pet's skills.https://a4-images.myspacecdn.com/images ... e/full.jpg
As you can see, I have clicked on the first skill of the pet in the second slot of the active team. This makes a drop down menu showing both skills available. I can then click on which of the two I want to use.