The figure below shows the Proxy section of the Preferences dialog:
In this section you configure the default proxy settings that will apply to Worls that are configured to use the global proxy configuration. It is possible for individual worlds to override the settings configured here, see Section 4.1, “General”.
The default setting is No proxy, which means connect directly to the MUD's host. Alternatively, you can use a SOCKS4, SOCKS5 or HTTP server. You must provide the proxy server hostname or IP address and the port to connect to. If the proxy requires authentication, supply the credentials in the Username and Password fields.