How to schedule a method from another cclayer implementation file

How can I get my scheduler to call a method inside another implementation files ccLayer?

Here are the files I have:

GameHUD.h
GameHUD.m
GameScene.h
GameScene.m

Scene setup under GameScene.m

+(id) scene
{
    CCScene *scene = [CCScene node];

    GameScene *GameLayer = [GameScene node];
    [scene addChild:GameLayer];

    GameHUD *HUDLayer = [GameHUD node];
    [scene addChild:HUDLayer z:2];

    return scene;
}

My Scheduler inside GameHUD.m

[self schedule:@selector(movePlayerUp)];

The method I would like to call in GameScene.m

-(void) movePlayerUp {
    Player.position = ccp(Player.position.x, Player.position.y + 1);
    Player.rotation = 0;
}

I'm still a few months new into Cocos2D and Kobold2D. I know I need to start by changing my 'self' to 'GameLayer' but apart from that I need some more help. Thanks.

Save a pointer to the GameScene in GameHUD, like this:

Add an @property to GameHUD.h

@property (assign) GameScene *game;

Now set it on your scene method

+(id) scene
{
    CCScene *scene = [CCScene node];

    GameScene *GameLayer = [GameScene node];
    [scene addChild:GameLayer];

    GameHUD *HUDLayer = [GameHUD node];
    HUDLayer.game = GameLayer;
    [scene addChild:HUDLayer z:2];

    return scene;
}

and use the property to call the scheduler:

[game schedule:@selector(movePlayerUp)];

you can check if game is nil to avoid errors too:

if(game!=nil)
{
    [game schedule:@selector(movePlayerUp)];
}