If you are trying to find the WAN side Static IP for your terminal, you can browse to http://www.systemcontrolcenter.com/#!/home/information when connected to the terminal, and see a field for the IPv4 address. That will be the address that outside connections need to connect to, to get into your LAN.
You can find more information on my personal website (which happens to be hosted behind an SME terminal, so it *might* be a bit slow if you aren't blocked by my firewall). https://chucksbasix.com/2017/10/12/hughesnet-ht2000w-port-forwarding/
Also, yeah, can't really support SME customers here, the site was designed for residential customers... But hey, something that I can at least throw out there. :)
Also, yes, we are essentially double-natted if we don't have a static IPv4 address. Websites and outside services may think we are always double-natted if WAS (Web Acceleration Server) is enabled.
Note: This information applies only for SME customers with an HT2000w... If you are a larger customer, such as an enterprise or managing cellular networks, your equipment may be very different and will require a call into business support...