Actions with this trait allow you to follow up earlier attacks. An action with the press trait can be used only if you are currently affected by a multiple attack penalty. You can’t use a press action when it’s not your turn, even if you use the Ready activity.
Some actions with the press trait also grant an effect on a failure. The effects that are added on a failure don’t apply on a critical failure. If your press action succeeds, you can choose to apply the failure effect instead. (For example, you may wish to do this when an attack deals no damage due to resistance.)
Source: Player Core pg. 141
Requirements: You are wielding a ranged weapon
Using your last shot to gauge your accuracy, you can fire off a quick shot to interfere with a foe in combat. Make a Strike with a ranged weapon. If the Strike hits, the next creature other than you to attack the same target before the start of your next turn gains a +1 circumstance bonus to their roll, or a +2 circumstance bonus if your Strike was a critical hit.