I have a politics forum site (something.com)for other country. I live in UK and I want to make it .org as I am an administrator of the site. Ithink I can register for something.org but legally where and in which office in UK should I register ?
I've registered the domains for my sites via domain hosting providers - with no problems. If you will be directly hosting your site, then I guess you would do so with Nominet, for .org.uk.
For .org, I think I would go here.