Pidgin is the most popular instant message client for GNU/Linux, Windows, and Mac. You can download Pidgin from pidgin.im/download. For Mac, check out Adium, the native build of pidgin for Mac.

When you start pidgin, hit Ctrl+A –>> the Add… button to add an account.

Select Protocol: XMPP

1. Under Basic tab, set these values:
   
   Username: your CgAn username
   Domain: jab.cyberguerrilla.org
   Password: your CgAn Passwords

2. Under Advanced tab, set these values:
   
   Connection Security: Require encryption
   Connect Port: 5222
   File Transfer Proxies: proxy.cyberguerrilla.org

3. Under Proxy tab, check these values:
   
   If u select: “Create this new account on the server” it will register a account for you after you push Add button.

Using OTR

See the Off the Record tutorial for details on using end-to-end encryption with Pidgin.