Got a second hand Mavic Pro, what I should do to register it under my name ?

Thank you in advance

Congrats on the purchase.

You just log in via your account (same email address as you use on the forum) and it will record your flights.
The only thing you won't get is an icon under your avatar on this forum. Because that will only happen when you buy a new drone.
Not sure why they did it that way, but that is how it works.