How do I set up Outlook Web Access on Netgear SSL312 VPN

I have a Netgear SSL312 VPN on my network. I want to set up access to Outlook Web Access for Exchange Server 2003.

Port 443 is being used for a custom service on my firewall.

Where can I find specific instructions on how to create a “bookmark” or other method of setting this up?

Thank you in advance for assistance.

Jason