Some birds have an obvious problem.
Other birds have silently obtained the status of the chief in the family command structure - which wasn’t planned at all.
Your bird needs to be educated like a little child: set up clear restrictions and teach him to distinguish between wanted and undesirable behaviour.
We work closely together with Mrs Hildegard Niemann, certified biologist. She offers you behaviour therapy, parrot training and behaviour consultation ( http://www.papageien-training.de/ )