It is pretty easy. You'll want to setup a UILabel in Interface Builder and you'll see a property something like this:
@property (strong, nonatomic) IBOutlet UILabel *myLabel;
Right after your NSLog statement you'll want to insert this code:
self.myLabel.text = [NSString stringWithFormat:@"x=%f, y=%f, z=%f", accelerometerData.acceleration.x,accelerometerData.acceleration.y,accelerometerData.acceleration.z];
Of course you may want to make it look nicer but this should be enough to get you going.