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    $Torrentz_Interface->submit_form(
        form_number => 1,
...
            pass       => $password,
        }
    );

<form action="/profile" method="post" class="profile">
<fieldset>
...
<div class="s"><input name="go" value="Login" type="submit"></div>
</fieldset>
</form>

torrentz$ mech-dump http://www.torrentz.com/profile
POST http://www.torrentz.com/profile
  user=                          (text)
  pass=                          (password)
  go=Login                       (submit)