Swipe down from the top of the screen, tap Cast or Screen Cast (Smart View on a Samsung) and choose the TV. Then turn it on its side.
The steps to show an Android phone's or tablet's screen on a TV with Chromecast, under the heading Chromecast (not translated): swipe down for the quick settings and tap Cast or Screen Cast, as Android calls them in this language (use Android's own words in the language; Smart View is Samsung's name and stays). Then to turn the phone or tablet on its side, as the big screen is wide
Wàccel sa baaraam ci kaw ekraŋ bi ba ci suuf, bësal « Cast » walla « Screen Cast » (« Smart View » ci Samsung) te tànn tele bi. Ginnaaw loolu, tëral ko ci wetam.