I don't know if anyone's figured this out or not, but here's how I fixed the problem.
In /catalog/includes/modules/sts_inc/sts_column_left.php
I added these lines:
//Add Vistor Email box
require(DIR_WS_BOXES . 'visitoremail.php');
$sts->restart_capture ('visitoremailbox', 'box');
And added "$visitoremailbox" into the template html file, and it worked just fine.