To use a module, first you need to load it. Soo, your code should be:

  use Mapps::Auth ;
  $auth = new Mapps::Auth->auth($uname, $passwd);
  ...
[download]

Note that your module need to be in some @INC path. To see what directories your Perl interpreter is lookin for modules, get the output of this code:

  foreach my $INC_i ( @INC ) {
    print "$INC_i\n" ;
  }
[download]

Here the output is:

C:/Perl/lib
C:/Perl/site/lib
.
[download]