1. Please update Joomla to the latest version, which currently is 1.5.26: http://www.joomla.org/download.html. Remember to keep your Joomla intallation up to date!
2. This thread is over two years old... And you are using JoomFish 2.2.3 while this is a JoomFish 2.0.x board...
I'd assume you're better off creating a new topic in the appropriate JoomFish 2.2.3 board (viewforum.php?f=49) (a) detailing your problem, with exact error messages if you see any and what you do to recreate them, (b) giving your System Details and (c) mentioning what you have tried so far regarding your problem and where you've read it.
As a side note: JoomFish 2.2.3 still has a "jfrouter" plugin and you can find it here: Backend > Extensions > Plugin Manager. You are looking for a plugin with the Plugin Name "System - jfrouter", of the Type "system" and in the File column it says "jfrouter".