I need to replace the water spout for my bathtub which is attached to the tile on the wall. I have tried turning it like, unscrewing but cannot. Could someone please tell me how this is fixed.

Ash, November 2006

I've encountered one European fitting like you describe that was fixed by a single grub screw underneath the spout, adjacent to the wall.
Every other one I have seen has been screwed into place onto a male thread projecting from the wall.
It may well be corroded. If you can get some WD40 into the thread it will help. Apply the lubricant twice daily for a week to ensure good penetration.
A few sharp taps with a mallet or rubber hammer may help to break the corrosion weld.

Big Softy, November 2006