Dismiss modal segue

I am trying to understand modal vs push segue and read few Q & A like this and this. One point I am confused from these answers is "The presenter should take care of dismissing the VC it presented."

For example, the example I am writing shows UIPageViewController something like the example available here, with a button at bottom of the page with name "Skip".

In story board I have created a segue (of type Modal) from "Skip" button to another "View Controller", but where do I need to dismiss the UIPageViewContoller (if at all required) and how? Any help would be appreciated.