Perl modules are installed with a CPAN client, usually
cpanm. For example:
<whole lot of initial conf questions>
cpan> install Catalyst::Plugin::Session
<whole lot of installing>
Google 'install Perl modules with CPAN'. But these modules are almost
certainly already installed if Catalyst is.
On the other hand, if you're asking how to configure your application to
use this plugin, you simply add it to your list of plugins in your main
use Catalyst qw(
This is covered at some length in the very fine Catalyst Tutorials.