Boosters need to be equipped before they can be used in a match. This can be done on the Booster Equip Screen, which is accessed by entering a Tour from the Tour Menu, or starting an Event match.

The number of Boosters you can take into a match is limited by the Slots and a maximum count. The Slots and equipped Boosters count are found on the left hand side of the Booster Equip screen.

Tap a slot to select it, then tap an unlocked booster from the right hand side of the menu to equip. To add or remove Boosters from a Slot use the Minus button.

When the total number of Boosters on both Slots is equal to the maximum count, then no more can be added to either slot. To add more Boosters to a particular Slot you first have to remove Boosters from the other Slot. It is possible to equip a single Slot with the maximum number of Boosters.