Hello @geraldinenadia and welcome to the Community. If you are referring to your paid Premium membership, that is part of your account. It isn't tied to that device. If you have a paid subscription and buy a Fitbit that comes with a free trial, DON'T add it to your account until you read and understand the section in this Help article marked "How do I purchase or start my trial of Fitbit Premium?" Looks like you can cancel your old membership, get a new free trial, then pay for the new membership, but I have no personal experience with this.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.