Private Proxies in Zennoposter

How can i add private proxies in ZENNOPOSTER and what is the good format?

You can add your Private Proxies on Zennoposter with using HelpWizad that you can find in Sources, select 'onesource' and next select 'file on disk' to specify '.txt', then select 'pay' and next click 'add'. You'll find proxies in alive proxy list

Here is the proxy format usernameassword@iport

Thank You very much !