Please refer to your product manual for relevant settings. You can connect a wired network or a wireless network. Your TV has built-in wifi function, as shown in the following figure:
Then set up the TV network, press the setting key on the remote control, and select the way you want to connect. After the connection is successful, you can surf the Internet.
As for live broadcast software, I suggest you search for "watching movies" or "Taijie video" in Hisense App Store and try to download and install it. You can also download es file browser in TV App Store and install it on TV, and then download TV APK installation packages of "Dragon Live", "Fengyun Live" and "Aishang Live" online with U disk or SD card, put them in the root directory of U disk, and then insert the U disk into the USB port of TV.
I hope I can help you and wish you a happy life.