Adding domain names to prefs manually

Hi -

I'm new to this group and to NeoMail. I'm hoping this is an easy question.

I use Neomail through Jumpline.com. I need to go into the code and edit my list of domain names. I have several sub domains, but they don't come up in the drop down box. I already talked to Jumpline, and they can't add them for me. 

From peering around in the code, it looks to me like the var I need to edit is the $domainnames[] array in neomail-prefs.pl). 

The problem is, I can't find where the values to these variables are stored. The only files I have access to on my jumpline account are neomail-prefs.pl and neomail.pl. 

Also, my Perl is a wee bit rusty. If you happen to know the syntax for adding an element to an array in Perl, and want to throw that in as a bonus, I will be most appreciative.

Here's a code snippet of what I found --
line 204 (neomail-prefs.pl) -->

$temphtml = popup_menu(-name=>'domainname',
                          -"values"=>\@domainnames,
                          -default=>$prefs{"domainname"} || $domainnames[0],
                          -override=>'1');


Thanks! - Zolla