Wel, the simplest way for Chain Proxioes is as

in your Browser setting, Check use Proxy server and then
in address , type proxy1ort proxy2ort proxy3ort proxy4
port port

For Example

Address 210.33.3.3:8080 222.44.56.2:8080 22.44.55.4
Port 8080

Remember, for last proxy u hav to type its port in the Port place

thanks WSalaam