Hey Kamil,
thanks for your question, I guess your are talking about creating a new IEM instance in the IE HUB, right?
Could you please check the in the User Management of your IE HUB Organisation, if you have the IEM_Manager role? This role is needed for creating new IEM Instances.
If you do not have this role, please talk with your Organisation_Admin.
I hope these information are helpful for you.