With Print Audit 6, proxy configurations are read from the internet settings of the user running an Administrative tool, or the user that the Database communicator runs as.
Print Audit Secure however, uses a different method for configuring the proxy:
1) Open Windows Explorer
2) Navigate to: C:\Program Files (x86)\Print Audit Inc\Print Audit Secure Server\Config (or the appropriate directory for your installation)
3) Locate the proxy.config file, open it for editing.
More information on what needs to be placed in this file can be found on this page.
Below is a sample proxy.config file for an environment where the proxy server is located at ip 10.0.0.1 and listens on port 8080: