Since I suppose you are using activestate's activeperl, you will use ppm, as stated in the previous post.

When you are sure that perl installation folder is in your path variable of the operating system, typing ppm help in the command line from the dos prompt issues the following lines:

Commands:
    exit              - leave the program.
    help [command]    - prints this screen, or help on 'command'.
    install PACKAGES  - installs specified PACKAGES.
    quit              - leave the program.
    query [options]   - query information about installed packages.
    remove PACKAGES   - removes the specified PACKAGES from the system
    search [options]  - search information about available packages.
    set [options]     - set/display current options.
    verify [options]  - verifies current install is up to date.
    version           - displays PPM version number
[download]

Pay attention to the fact that you need the exact module name, as given by the module creator.
You can issue the search command to look up for a specific package.
Hope I've been of help :)