Solution:
If using the wireless network, please open the Mi TV Settings to select the network, search for the network and connect, and then press the "home" key to return to the main interface. Then can enter the video from the home page or find the video from the search entry in the upper left corner for watching.
If using a wired network, please insert the cable into the RJ45 Ethernet interface on the back of the TV, and then press the "home" key to return to the main interface to enter the video from the home page or find the video from the search entry in the upper left corner for watching.
Notes:
If you don't know the setting entry for the first time, please press the home button of the remote control and then press the up button to see the "Setting" entry.