Hi @mitzi,
Welcome to our community! 
If all three particle systems are not working, check if the exposed fields in the Inspector of the Rocket in the Hierarchy are referencing child game objects of the Rocket. Ideally, these game objects should have a particle system attached.
Do not reference the particle systems from your Hierarchy because they are not in your scene.
Please let me know if this helped you fix the issue.
See also:
- Forum User Guides : How to apply code formatting within your post
- Forum User Guides : How to mark a topic as solved