chargrill is right, but try this

use strict;
use warnings;
use Win32::OLE;

my $word = Win32::OLE->new('Word.Application') or die $!;
$word->{'Visible'} = 1;
my $document = $word->Documents->Add;
my $selection = $word->Selection;
$selection->TypeText("Please click here now");
my $range = $document->content;

my $search = $range->Find;
$search->{Text} = "here";
my $link = $search->Execute();
   print $link ? "yes\n":"no\n"; #just so you can see

$document->Hyperlinks->Add({
                            Anchor => $range,
                            Address => "http://www.perlmonks.org"
                            });
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