Open the eSIM e-mail or the order page on the phone and tap "Install on Android". Then step by step:
The QR code is in the e-mail and on the order page. Scan it with the camera from another screen: open the e-mail on a computer or a second phone.
The SM-DP+ address and activation code are in the e-mail and on the order page, with "Copy" buttons next to them.
After installing: name the eSIM, turn on "Data roaming" for it, and on arrival pick it for mobile data. Turn off airplane mode — the phone finds a local operator on its own. Network registration takes up to a minute. If there is no network, open the eSIM settings and pick an operator manually.
Simix · How to install eSIM