Add Controls to UIPageViewController

I need to add some buttons to my UIPageViewController. I followed this tutorial and you will notice that at the bottom there is a button below the dots. How do I accomplish a similar thing? I need to add 3 buttons to the view.

Tutorial: http://ift.tt/19i0eKt

Thanks in advance, and sorry if I have missed something obvious. I have searched quite a bit.

- (void)viewDidLoad 
{
     [super viewDidLoad];

    _pageImages = @[@"Step1.png", @"Step2.png", @"Step3.png"];

    self.mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];

    self.pageViewController = [self.mainStoryboard instantiateViewControllerWithIdentifier:@"PageViewController"];

    self.pageViewController.dataSource = self;

    RTMPageContentViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];

    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];
}