whenever i try to run get_iplayer i get "Can't locate HTML/Entities.pm in @INC" as well as " (you may need to install the HTML::Entities module) (@INC contains: /usr/local/get_iplayer/perl5/lib/perl5 /Users/[name withheld for privacy]/perl5/perlbrew/perls/perl-5.28.0/lib/site_perl/5.28.0/darwin-2level /Users/[name withheld for privacy]/perl5/perlbrew/perls/perl-5.28.0/lib/site_perl/5.28.0 /Users/[name withheld for privacy]/perl5/perlbrew/perls/perl-5.28.0/lib/5.28.0/darwin-2level /Users/[name withheld for privacy]/perl5/perlbrew/perls/perl-5.28.0/lib/5.28.0) at /usr/local/get_iplayer/bin/get_iplayer line 48.
BEGIN failed--compilation aborted at /usr/local/get_iplayer/bin/get_iplayer line 48. "

i have no idea how to use perl, can anyone help me get through this issue?

As you are told in the installation docs, Perlbrew is not supported. Use the system Perl or learn how to install modules with Perlbrew. Thread cl0sed.