After I installed the z130bt I see it says hd radio built in I go to the tuner and it's shows me that there's 2 channels of hd how do I switch to the hd channel I try the arrow it goes to next station and the arrows on the unit itself takes me to the next preset so how do I change hd stations???

I believe u use the softkey arrows to change sub stations. It only works when it locks into the digital HD station, which takes like 3 or 4 seconds.

I tried that it goes to the next station example hot 97.1 it has 2 hd subs I try to press the onscreen it just goes over to 97.3 static the physical button takes me to the next preset so I'm wondering how it's making me crazy no where does it say how

I touch the arrows on the screen and I am able to change to the HD sub-channels on the same band.