Adding an object to a NSMutableArray when button is pressed?

Basically, in the FirstViewController I have a button that when pressed it adds an object to the SecondViewController which is a TableViewController. I have setup an empty NSMutableArray so when the user taps the button the object will be added. I am new to iOS Programming so I might have setup the code wrong. I would really appreciate if anyone can help with this. Thanks.

This is my code for the FirstViewController:

#import "FirstViewController.h"
#import "Custom.h"

@interface FirstViewController ()

@end

@implementation FirstViewController
@synthesize array;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (IBAction)button:(id)sender {
    label.text = @"hello";
}
@end

This is my code for the SecondViewController:

#import "SecondViewController.h"
#import "Custom.h"


@interface SecondViewController ()

@end

@implementation SecondViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
    // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    array = [[NSMutableArray alloc]init];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
    return [array count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath    *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    Custom *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier  forIndexPath:indexPath];
    if (cell == nil) {
        cell = [[Custom alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

// Configure the cell...
    cell.label.text = [array objectAtIndex:indexPath.row];
    return cell;
}