Missing Frame Marker in Prefabs

Hello developers,

I want to use Frame markers in my Vuforia app.

I have seen some tutorials how to do it but they all put a frame marker from the prefabs to the scene.

In my prefabs, there isn't any frame marker entry. Is this feature maybe not longer available in Vuforia?

I'm using the current version of Unity (5.6) and Vuforia api (6.2).

I hope you can help me.