Zencart 1.38
Simple google analytics 1.2.2
Use older urchin = no

I searched the thread and am still confused how to set up alias domains. Posts ~#1015 seem relevant but adds to my confusion.
I have mysite.com and anotherurl.com that points to mysite.com. The redirect is set to point to mysite.com by the hosting company and not by any settings on my end (like htaccess).
Im simply trying to track how many people directly typed in anotherurl.com to get to mysite.com
Is this actually already being tracked in analytics as a “traffic source”?
If I understand right, to track anotherurl.com I set should set up another profile inside google such that I have:
Exsisting UAxxxxxx-1 and
Other url UAxxxxx-2

Right or wrong?

Then, I am totally clueless what to do next. One post says to add UAxxxxx-2 in admin/configuration/GoogleAnalyticsConfiguration .
Is this correct? There is only one field in the interface. Would I just put both with a comma in between (as in UAxxxxx-1, UAxxxxx-2)?

Other posts mention modifying code but I am lost as to what to modify. I see tpl_main_page.php mentioned frequently but it does not look like anything in that file specifically references the particular UAxxxx number.