More info on the contest:

Wiki: http://nvsc.wikia.com/wiki/NVSC_Wiki
Forums: http://ovsc.proboards.com/board/26/northvision-song-contest

For joining, you need to be signed to the forums (http://ovsc.proboards.com/)
and then you'll need to join up in the waiting list. You can not choose a country, but you'll get the latest free country as soon as you're on the top of the waiting list.
http://ovsc.proboards.com/thread/9159/nvsc-waiting-list