How do I change the security category for a specific Page Wrapper that has already been created?
You cannot change the security category for an existing Page Wrapper, as it may already be in use and this could cause a conflict. What you need to do is create a copy of the Page Wrapper and set the security category for the copy. Next to the Page Wrapper in the Page Wrapper Editor click on "Duplicate" under "Actions". From here you can choose a new name and security category, but the content of the wrapper will remain the same.