How i activate the green screen filter(Chroma Key: Simple)?

Hallo i am cutting a video and i want to make a green screen effect in it. But when i set the effect it wont work. I tried to solve the problem but no one of the solutions worked…
Sorry for bad English i am from Germany

This tutorial might help you with the green screen effect.

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You can remove the green screen using chroma key: simple or Chroma key: advanced video effects.
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