In the configure cell section of your tableView delete, you can add a button to the cell of your table as follows:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    // Configure the cell...
        // add friend button
        UIButton *addFriendButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        addFriendButton.frame = CGRectMake(200.0f, 5.0f, 75.0f, 30.0f);
        [addFriendButton setTitle:@"Add" forState:UIControlStateNormal];    
        [cell addSubview:addFriendButton];
        [addFriendButton addTarget:self 

You’ll also need to add an outlet for when someone clicks your button:

- (IBAction)addFriend:(id)sender
    NSLog(@"Add friend.");

Helper link: