iOS Segue from button not initially on view controller

[Miscellany]

I've just joined this forum, and I've only started programming for iOS, so this may be a very stupid question. I want to move to a different view through a button that I created programmatically. At the moment I have:

        UIButton *sr = [[UIButton alloc] initWithFrame: buttonFrame];
        [sr addTarget: self 
                   action: @selector(ViewDetails) 
         forControlEvents: UIControlEventTouchDown]; 

- (IBAction)ViewDetails:(id)sender {    
    
    [self performSegueWithIdentifier:@"DetailsSegue" sender:self];
}

I'm not really sure about DetailsSegue, at the moment it and the first screen are embedded in a navigation controller together, with it as a push style, and the first as rootViewController. I think maybe I need to make a UIStoryboardSegue, but I didn't understand how to do that...