I'm not really sure what the 'challenge' is? Do you want to be able to submit that form?
in reply to Re^2: Perl mechanize get Error!
in thread Perl mechanize get Error!
#takes what vacancy to search as first argument on command line
my $mech = WWW::Mechanize->new();
my $vacancy = $ARGV;
#(^^without plus sign occuring copied over)
$mech->click_button(value => "Search Vacancies");