page not showing for developing an app

I am admin. of 4 pages, when I go to develop an a开发者_如何转开发pp, it will only show 2 of those pages as options ? The one I need doesn't show. They are all the same type of page. How do I get the needed page to show?

The pages are not supposed to appear on the developer menu so I'm wondering where exactly don't these 2 pages show up? Do you mean they don't show up when you want to add an app to them, as a tab? They don't show up on your Insights menu, to see their stats?

Please, elaborate your question