Simple: you're going to need to use the Credits currency. Before you pick up more of these over time you'll have to head over to the cash-shop to get hold of some more. Prices vary across regions so check from your device.

Simple: you're going to need to use the Credits currency. Before you pick up more of these over time you'll have to head over to the cash-shop to get hold of some more. Prices vary across regions so check from your device.