How do I sync data between an Option List and App Variable?

How do I link

  1. One page has a list that appears under ‘Option list’. I typically add/remove members from the list.
  2. The second page appears to be populated by App Variables

I would for any change I make to the Option List data to appear in the data pulled from the App Variable. I’m not a developer and someone help me with setting this up, but they are no longer available to assist me. Any help will be appreciated