Ferret

Hi, can someone give me a basic guide or any links to install the ferret
plugin. Ive searched the forum but stil having problems.

Im currently looking at this:
http://www.railsenvy.com/2007/2/19/acts-as-ferret-tutorial

but having trouble.

when i enter this: require ‘acts_as_ferret’ in the environment.rb and
run it, it stops my server from even working.

also where do i enter this:

ruby script/plugin install
svn://projects.jkraemer.net/acts_as_ferret/tags/stable/acts_as_ferret

is it from a command line? because i get the error, "No such file or
directory – script/plugin (loadError).

Are the plugin files meant to go in:
C:\InstantRails\ruby\lib\ruby\gems\1.8\gems ?

Ive been struggling for ages with this, Any help greatly appreciated