Unable to press select

[Arkwell]

I just got the new super mario bros iso and it works fine..up until I get to the point where I choose a level. All the buttons are mapped fine, and the keys are the correct way (as in up is actually up etc). But I cannot seem to 'select' a world. It has a symbol of the D-pad and the left and right are highlighted in red. What do I press to select this??? Ive tried everything..every button i press just sends me back to the main map...i dont understand :/