TOP > Various Settings of the Product > The Product's [Settings] Menu > [Interface] Menu > [Network] > [Settings] > [Wi-Fi] > [Proxy]
If you have set the address of the proxy server in the [Server] menu, select this to set the port number.If you have set the address of the proxy server in the [Server] menu, select this to set the username.If you have set the address of the proxy server in the [Server] menu, select this to set the password.