No, that won't help. He's looking to create powerups, not items.
Anyways, there are two ways to do this - you can choose to make it be picked up automatically when a ground unit moves near it, or be picked up when you right click it with a ground unit.
To start off, create a Set effect. Then, add the effect "Pickup Remove", this will remove the powerup once someone uses it. Additionally, you will want to add an effect that will do whatever your powerup is supposed to do; ie restore life, apply a speed boost behavior, or whatever.
Then, if you want a powerup that is automatically used when you move a unit near it, duplicate the "Pickup" ability, change the effect to your set effect, and then give that ability to your powerup unit. Alternatively, if you want a powerup that you right click on to use, go into your unit, go to Cost -> Powerup Effect, and change that to your set effect.
