Censo electoral de ciudadanos de la Unión Europea, no españoles, residentes en España

You may have got inscribed on the padrón, the town hall register, at some point but hadn't asked for the right to vote. If you don't want to vote in next year's local elections in your pueblo, it's because you don't care.
However, it's not only important for you, it's also important for all home-owners that we vote, as the town hall will take more notice and pay us more attention. We will, in effect, provide a control on the ayuntamiento.
It's true that some of us can't vote, or can't get onto the padrón (for reasons beyond our control). But, with enough numbers, we can move mountains.
Form for registering to vote in Spain. Download form CERE.DFA-1 from here (Spanish, English, German):

http://www.granada.org/obj.nsf/in/FIXMAUP/$file/Inscripciioncere.pdf