Add Page greyed out?
Saw many questions about this but without a good solution.
Until I search Pages' help and noticed,
You might be using the wrong method to add or delete a page, depending on whether you’re working in a word-processing or page layout document. The process for adding and deleting pages is different for each type of document, so you need to know what type of document you have.
So, click on Document in toolbar, then click Document tab, unselect "Document Body"
that's it! change to page layout document, you can easily add or delete or rearrange, just right from Thumbnail view.