Page is superimposed on theme page

I’m working from the Presentation theme
1. I went to Appearance-> Menus and selected About Us for a new page.
2. I then changed the name of it to Ministry Approach.
3. I then developed the whole page and updated it, and shows in the Frontend Visual Composer, but when I check it on the website the Presentation demo page for About Us is displayed.
4. I went to All PAGES and selected the About Us page and deleted it.
5. I updated my new page again, and it says sorry file not found, and there is a blank page.
How do I get my new page to publish from Visual Composer?