Photoshop :: Blending Different Parts Of Picture

I have a picture and I wanted to follow the tutorial but my english isnt that great so I have somethimes problems during the activity.

I wanted to play with a picture doing makeover.

First I changed the eye color

''New Layer.
Use a hard brush that's the exact same size as the iris, and paint with the desired colour over top of the original iris. Set the blend mode to Hue/Softlight/Overlay. Your choice. The blend mode choice is affected by how light/dark your replacement colour is. Layer Opacity can also be lowered to make the effect more subtle. In my header image, i used 'Hue' blend mode.''

So I did.

Then I wanted to do this:
''Select the white of the eyeball; either using Quick Mask or the selection tools. Add a HUE&SAT Adjustment Layer right above the smoothed duplicate layer. Lower the Saturation and raise the Brightness until the white looks 'almost' white. Don't go too pure white, or it'll look real fake. Click the Layer Mask for the Adjustment layer, and apply the 'Blur More' filter 2x -- to soften the edges a bit, and blend this new white area into the outer edges of the eyeball.''

I did tried this but didnt worked.

When I color it White in the white section of the eye to make it more white, It colors .

But then I need to paly with the HUE/SAT option.

When I do that The PICTURE goes into Hue, not the WHITE PLACE.

I only want to HUE the White place that I marked, not the entire picture.