Hi David,
If I remember correctly, the gallery was intended to be given to a specific client and that the creator already had the client's contact information. The Reply-To is set in the exporter dialog under the field name 'Email From'. The data is stored in the template/desc_info.xml file under the <EmailFrom> tag within the generated gallery.
The next version of the exporter will have submission form where the client can enter their contact information.
-Jerry