Proxy IP will not turn off?

I recently used a proxy IP to access the Internet, and someone else is using the same IP proxy banned from the same place I was using (4chan). Now I can not access more and want to navigate the site using my own IP. I use the Opera browser and I disabled the proxy settings and reset my IP of your server, but I still identified as using the IP of the proxy and keeps me banned! How I can change using a proxy IP address from my account?

Here is a list of active proxy sites to unblock websites and surf the internet anonymously … and if you make the proxy site also anonymous, I recommend u go to http://www.kappi.co.cc does not have the word proxy or anonymous on the site – completely anonymous. active sites are another 1. http://www.proxywall.co.cc 2. http://www.officeproxy.co.cc 3. Webmaster-http://www.proxyroom.co.cc also if u like to own a proxy site, just visit this site and happy browsing http://www.proxymodify.com I think will help ua lot

5 – Atmosphere: The Mobile Internet