Please be aware that the use of proxy servers without the express permission from the owner of the proxy server may be illegal in some states and/or countries. Use at your own risk.
Use your favorite search engine and search for 'proxy server list'. You'll find many sites with lists of proxy servers, their IP address, the port they listen on, and usually what country they are in. Write down a few of them.
You may see references to four different types of proxy servers:
Proxy server list 

Transparent Proxy

This type of proxy server identifies itself as a proxy server and also makes the original IP address available through the http headers. These are generally used for their ability to cache websites and do not effectively provide any anonymity to those who use them. However, the use of a transparent proxy will get you around simple IP bans. They are transparent in the terms that your IP address is exposed, not transparent in the terms that you do not know that you are using it (your system is not specifically configured to use it.)

Anonymous Proxy

This type of proxy server indentifies itself as a proxy server, but does not make the original IP address available. This type of proxy server is detectable, but provides reasonable anonymity for most users.

Distorting Proxy

This type of proxy server identifies itself as a proxy server, but make an incorrect original IP address available through the http headers.

High Anonymity Proxy

This type of proxy server does not identify itself as a proxy server and does not make available the original IP address.
Please make sure to read about anonymous proxy risks before using a proxy server.
If you need further assistance using proxy servers please post a question in the proxy server forum.

Browser Settings

How to Use?
Mozilla is the famous browser. So i will explain how to use the proxy servers in Mozilla.

Open Mozilla FireFox.
Select Tools from menu bar(or simply press ALT+T)
Click the Options
Small window Will Open.
Navigate to Advanced tab
Click Settings.
Now select the Manual Proxy Configuration Radio Button.

Paste the one of the Ip address of Proxy server and set the Port as defined in the list.
For Eg:
Let's take this proxy
058.056.108.114:80
Here ip address is 058.056.108.114
Port no is :80
That's all click ok.
Now to check the whether your ip address is changed or not, visit "www.whatismyipaddress.com".