Activating something on multiple objects

Hello, I want for example activate script or child-gameobject of all GameObjects with tag “Player”.
What should I use? For example GameObject.FindGameObjectsWithTag() is only giving me list of objects in return but how can i use it?

Try using If(GetComponent().CompareTag(“Player”)) then add those objects to a gameobject array, like this? examplearray[0].add(GetComponent()).