Block site from google index | General - All in One SEO Pack Pro Forum | Support | Semper Plugins

Every time i build a site on a temporary subdomain, within a short period of toime it gets indexed by google. I set the site up in my google verification so that i could block the pages. I removed each page of the site using url. Google states it must be blocked in robots for permanent blocking. Do not know how to block through robots.txt. I set block and update but no change. Before i do that i delete robots.txt but it never changes. How to?

http://iris.nitrokick.net/