The Sales Monitor 2

Hi. Sorry I ask. But how do you use Yandex Metrics? I signed in with google account and then pasted, for example, my pòrtfolio web address. Here is where I don´t know what to do: “Insert the code snippet in the HTML code of all the site’s pages. Place the snippet inside the or tags, as close to the top of the page as possible. This allows it to load faster so that it can send data to Yandex.Metrica even if the user closes the page right away.
If you change the tag settings after installing the code snippet on the site, you must update the snippet on all the pages.” What should I do here? Could you help me please? Is there a way to automatically see data on the Yandex app in my smartphone?