vermontamta on "Parent page not option under Page Attributes"

When I first set up my static pages initially, the option to make parent pages was available under Pages Attributes. I did not select it at that point. But now I have too many pages and I would like to make some of them subpages, but the page attribute option of setting a parent page is no longer available. I am using the Twenty Two theme. My blog link is http://amtavt.wordpress.com

Thanks
Chris