Hi there @Pokémon1234, welcome aboard to the Fitbit Community. Let me give you a hand with your concern. It's pretty simple and nothing to be alarm. Go back to your account and log in using the same credentials (Email and password registered on your Fitbit account)
Once you are there Tap in the account tab located in the right upper corner of the screen and you'll see an option to set up your tracker; go there and follow the onscreen instructions.
For more details review this post made by myself, it will be helpful to add your tracker back in to your account.
See you around and let me know if you have more questions.
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