Most exchanges use custom websites, marketplaces and member portals.
As content management is typically only done once, if you are using the basic generic design template website that comes with a software subscription, you'll find all of the manageable content on the Content tab in the older version of the vBarter software.
To access content management for your exchange, visit: http://manage.vbarter.com, and use the same username and password that you use to login to http://www.phoenix.vbarter.com.