To attack an enemy, your character's Focus Meter needs to fill completely. When this occurs, your character's turn with automatically start.
 
First choose your target by tapping on the enemy you want to attack. Some Status Effects may prevent an enemy from being targeted during a turn.
 
Next, tap the ability you want to use on the target. Power Move Charge Up and Cool Down counters need to reach zero before these abilities can be used. 
 
Once the attack is performed, the target will display the amount of health they lost, if the attack was effective, and will receive any appropriate Status Effects. If the enemy's health is reduced to zero, the target is Downed.