NSString *path = [[NSBundle mainBundle] pathForResource:@"content_iPhone"       ofType:@"plist"];
NSMutableArray *plist = [[NSMutableArray arrayWithContentsOfFile:path] mutableCopy];

// For testing purpose, get an object from the Array and add the object to array
newObject = [plist objectAtIndex:1];
[plist addObject:newObject];

[plist writeToFile:path atomically:YES];

NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)