Well, if you are trying to change it forever, then I suggest contacting your hosting company and asking them.

If you are simply trying to mask your IP on various sites, then I would simply use an anonymous proxy server.

By connecting to a proxy server, the web sites you visit will read the proxy server's IP and not your own.

I used to use a program called MultiProxy.

MultiProxy Tutorial

Only problem with MultiProxy is the proxy lists are outdated.

Simply go to Google and enter fresh anonymous proxy servers

Hope this helps. :)

if you use dynamic IP login the router and disconnect the connection. wait for about 10-20 seconds then reconnect it. if the ISP gives you the old IP then try it again.

if you want to use proxy IP go to stayinvisible.com get some IP

The only problem with using anonymous proxies is that you rarely get a very good speed unless your paying for a service. :(