Hi @Nada41, welcome to our forum!
Your question has been translated to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
On the link below you can find a how to guide on how to stream YouTube live on your device.
https://support.google.com/youtube/answer/9228390
Do note that this is not an Xperia service and the support I can provide for it is very limited and you will receive better and more accurate information from the Google Support.
I hope that helps!
