Transferring the image from You Tube from smartphone to Smart TV.

Hello! I have a Samsung Smart TV and a Samsung s6 smartphone and I have a problem with uploading a video from You Tube from a smartphone to a TV. There are no problems with transferring photos or videos from your smartphone to TV via a connection from the same Wi-Fi network. However, I can not send image from net YT to TV, smartphone and TV have the same Wi-Fi network switched on and nothing. I tried to combine and nothing came out. I am asking for some advice. greetings

Have you paired a YouTube account with a TV? What TV is it?

TV Samsung Smart 40D6100SW. And how to pair an account on YT with TV?
Sorry, but I'm a little green in these matters

Launch Youtube on TV, I will give you a pair option, the rest will be carried out by the wizard.

I launched youtube on tv and then it went OK. Thanks and best regards.