Alright. I had a look and it is indeed what I was searching for. The problem is now: I can't get the desired results. Have a look:
So this is my Label in the center of the UI (The label is a child of a Panel)

As you see the Target is the Player-Transform.
But as soon as I hit play, the Label moves to the lower right of the UI.

Of course in the Game-View the Label is displayed in the lower right. I want it to "hover" above the Player.
Wrong settings?