Set up Yandex Metrics

It is necessary to configure in Yandex Metric the so-called "referral tails" . That is, the application received by mail from Landing should contain in addition to the phone number and name, also the source from where the person came and on what request he found the site.
P.S. If the job is done well, I promise you a dozen more clients (or maybe more) for the same job and more. I'm waiting for you.