Make 2 already-created pages into subpages for a third?

I have two pages I have already created and tweaked extensively - but now would like to make them subpages of a newly-created page. How can I do that?

Official response from Jim Gilliam completed

Go to the two already created pages, click on settings and you will see a box there for "This page is a subpage of" - just change that to the newly created page.

Featured content sliders

I created three featured content sliders, and two of them aren't showing up properly. The Labels on the tabs below the photos are fine, but only one of the three - the first - are displaying the Headline/Action Text at all. The other two show no text. Ideas?