This is the main screen of the app when it opens. As with most apps, it has a menu which can be accesses by clicking on the three bars at the top left of the screen
Red Box TV
Red Box TV is a live tv channel app. Lots of live stream channels from all over the world. Simple layout and lists of channels. Most of the streams are not in HD which is good for people with slower or limited internet.
The default for the main screen is sports channels. To change to different countries or genres, click on one of the tabs on the top. You can also click and hold down the left mouse button and swipe right on the tabs to see more.
Make sure that MX Player is highlighted as your choice.
Next click on Always to choose the player. If you choose always you shouldn't see this screen again.
If you are using the app for the first time, you may see this window popup asking to choose a video player.