Quit-Log Out applet: How to change default logout, shutdown and screen lock commands

I am running Awn and Awn Extras 0.4.0 on Openbox, on Arch Linux and I'm trying to get the quit extras-applet to work. This is the output when running Awn from the terminal:

On log out:

Couldn't execute command 'xfce4-session-logout'

On lock screen:

usage: xscreensaver-command -<option> ........

On shutdown:

http://pastebin.com/zNh103Cw

How can I change what commands Awn uses for these calls? I have tried searching around for a solution, and tried using gconf-editor to change values for awn and poking around in /usr/share/avant-window-navigator/ but no luck yet.

Any thoughts would be helpful.

Edit: Added info