You should be able to do this yourself. See http://photosynth.net/faq.aspx#q15
It doesn't look like any of your panoramas are taken from the iPhone app (which you can associate a Place before uploading); the Photosynths uploaded from your computer can be associated to a place [of business] or location via this website. Just login and view one of your Photosynths... underneath the viewer, there's an Edit button.
Hope that answered your questions.