The following (adapted from the man page) works for me from the command line: 
use strict;
use Lingua::Ispell qw( :all );  # import all symbols
add_word_lc("shrdlu");
for my $r ( spellcheck( "hello hacking perl shrdlu 42" ) ) {
  print "$r->{'type'}: $r->{'term'}\n";
}

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When I go to my home directory, I find that "shrdlu" has been added to the file .ispell_english.

I think what you will need is to specify a use_personal_dictionary, giving a file that can be written from your web browser interface, before attempting to add words.

In reply to Re: adding to an ispell dictionary by tall_man
in thread adding to an ispell dictionary by CodeJunkie

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