Be aware that hooking up your TV to the Internet when you have a satellite internet provider is likely to eat an awful lot of data and you may run out of data very quickly.
You'll have to run through whatever the protocol is on your Smart TV for connecting to the HT2000W's WiFi. It's usually just searching for the network (the modem). When it searches and finds the modem it'll ask you for a password, and you enter the passsword that's on the back of your modem.
But, keep in mind that streaming can use a LOT of data, so watch your data usage closely. And, as alluded to by maratsade, connecting a satellite TV receiver to HughesNet to watch On Demand programs can use a HUGE amount of data, as the receiver itself can use data, too, and there's no way to control it.