Before embarking upon any installation, it's a good idea to download the module, unzip it and check out the documentation.
The simplest way to get Perl modules installed is to use the CPAN module itself.

If you are the system administrator and want to install the module system-wide, you'll need to switch to your root user. To fire up the CPAN module, just get to your command line and run this:

perl -MCPAN -e shell

If this is the first time you've run CPAN, it's going to ask you a series of questions - in most cases the default answer is fine.
Once you find yourself staring at the cpan> command prompt, installing a module is as easy as install MODULE::NAME - for example, to install the HTML::Template module you'd type:

cpan> install HTML::Template

CPAN should take it from there and you'll wind up with the module installed into your Perl library.
Let's say you're on your system command line and you just want to install a module as quickly as possible - you can run the Perl CPAN module via command line perl and get it installed in a single line:

perl -MCPAN -e 'install HTML::Template'

As mentioned earlier, it's always advisable to download a module yourself, especially if you're having problems installing with CPAN. If you're on the command line, you can use something like wget to grab the file. Next you'll want to unzip it with something like:

tar -zxvf HTML-Template-2.8.tar.gz

This will unzip the module into a directory, then you can move in and poke around - look for the README or INSTALL files. In most cases, installing a module by hand is still pretty easy, though (although not as easy as CPAN). Once you've switched into the base directory for the module, you should be able to get it installed by typing:

perl Makefile.PL
make
make test
make install

Reconfiguring CPAN

To alter the CPAN preferences, either edit the Config.pm configuration file manually, or use the following command in the CPAN shell.

cpan> o conf init

The init configuration option runs through all the configuration questions, which may be time consuming. For example, other o conf commands can be used to list, remove, and add mirror sites, and then to save the changes to disk.

cpan> o conf urllist
urllist
ftp://ftp.kernel.org/pub/CPAN/
Type 'o conf' to view configuration edit options

cpan> o conf urllist shift

cpan> o conf urllist push ftp://ftp-mirror.internap.com/pub/CPAN/

cpan> o conf urllist
urllist
ftp://ftp-mirror.internap.com/pub/CPAN/
Type 'o conf' to view configuration edit options

cpan> o conf commit
commit: wrote /usr/local/lib/perl5/5.6.1/CPAN/Config.pm

To manually edit the existing configuration file, either open the user-specific ~/.cpan/CPAN/MyConfig.pm directly, or locate the system-wide configuration file (stored somewhere under the perl @INC path list)

Reference:
http://sial.org/howto/perl/life-with-cpan/</div>