Dismissing a navigation view controller

I am currently working on a game for the iOS platform. The game's initial view controller is a login screen, and once the player logs in, he gets to a loading screen, and then a navigation view controller containing a table view with a list of current games. The storyboard's relevant view relations look like this: [login screen] --modalsegue-> [loading screen] --modalsegue-> [navigation controller] --relationship-> [tableview (with logout button)] I want to make a logout button at the bottom bar of the navigation view's [table view], which takes the player back to the [login screen]. How can I do this? Thanks in advance!