Changing the Master Page on a Skuid page

I am trying to clone a page and then change the master page that is associated with it. I see where it is listed on the Edit Page Properties, but can not see how to change it.

What am I missing?

Two ways.

1. SF Classic

2. Create a Skuid Page for the Page__c object and add that field to it in order to be able to edit.

This worked perfectly.  I followed the video.  Thank you so much for the help. 



Word of caution:  Process #1 as shown in the video CANNOT be used to to completely remove a Master Page from a Child.  Doing so will obliterate your page and any past versions of it, which will prevent restoring if you accidentally try this.