remove a sprite in the xcode sprite template

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Xcode

sprites

I'm working off the sprite template in xcode.

In MyScene.m we have

-(id)initWithSize method where I declare

SKSpriteNode *myArray[widthPixels][heightPixels];

then create a sprite

myArray[i][j] = [SKSpriteNode spriteNodeWithImageNamed:@"orange"];

and add it

[self addChild:myArray[i][j]];

everything displays as expected. later, when I run the method

-(void)mouseDown

i want to do something like this:

[self removeChild:myArray[10][10] cleanup: YES]

but myArray apparently isn't accessible from this method? how do I declare an array of my sprites such that I can keep track of them and remove individual ones at will including in different methods?