I have added new page in menu (Pages/Menus) and trying to create an html page (About us).

I installed CKEditor and it appears on the Page Content box. 

But I like to have easier editor with more function.  So I purchased WYSIWYGEditor (Visual Editor) from the store, and it works in pages such as Forum.

Unfortunately, it is not working where I wanted it to work, which is in new page created in Pages and Menus.

How do I replace CKEditor with with my Visual Editor in new page created in Pages and Menus?

Thanks in advance for your help.