can not use it with my Mac Desktop?

I just bought this game for my daughter from the app store for my desktop mac. I can not use my mouse pad. The wireless touch one? Are you not able to play this from a desktop? If so it does not say that in the info about this game. And if I am just doing something wrong please help! So far I highly dislike this app!

can not navigate the game about Worms™ 3