To make it work you need to
1 install plugin
2 register on their website
3 add your domain to their system
4 download some program from their website (not sure without viruses)
5 login in those program with your new account
And only then you can see the replies which work, but sometimes it loads style very long time, and first 5-10 seconds of video, website looks without style, very ugly and unclear.
The same plugin with a name: "SessionCam" doesn't work at all for me, their email with instructions doesn't come to me.
So I have found free online tool: https://insights.hotjar.com
(not advertise, just a user who try to find better the Yandex metrics replies.