The Proxy Server Parameters panel allows you to set the binding address and the port number used by the proxy server, and enable or disable the proxy server itself.
Proxy server enabled
Enables/disables the embedded proxy server
Listen port
Defines the listen port number used by the proxy server. This number should be also declared in your browser settings as your proxy server port
Listen address
Defines the listen address used by the proxy server. This address should be also declared in your browser settings as your proxy server address