A thimble-ful of additional explanation might be useful here...

When you use or require any external module, such as (in this case) HTML::TokeParser::Simple Perl must search for the appropriate module.

As you can see, the package-name above strongly implies that there's some kind of hierarchical, directory-like structuring going on, and in fact this is so. Perl will be looking for HTML/TokeParser/Simple.pm. But where will it look?

The short-and-incomplete answer is that it will iterate through a list-type variable, @INC, looking in each of these places for the directory/file in question. There are several ways to determine what's in that list, including use lib directives, the PERL5LIB environment-variable, and a predefined starter list which is built-in to Perl itself. You can use the command, perl -V (note the capital “V”) to display, among other things, the contents of this list.

Under your circumstances, I would say that it's fairly certain that the module you're looking for is not yet installed anywhere. There are, as you will soon see, several alternatives for how-and-where you may do so.