I have a system of four Nions on one Subnet and would like to control them from another subnet using a Wireless laptop. I can Ping the Nion and get responses from it and can also using a Web Browser to look at all four Nions. The only thing I can't do at this stage is Upload and Connect to it. Any ideas?

Yes. You need to configure a remote_link with Pandad.
All the documentation that you need to do that is here:
Pandad Administrator Guide
Please see Chapter 3.

Thank you Josh