Log into the same account/email to keep all your historic data.
Assuming you are using phone app, tap profile pic at top left to get to 'Account' page.
Look down the screen a bit for 'Set up a Device' and follow the prompts. Pick Inspire HR; it will say you already have a Charge 2 - is this a replacement? - yes; and proceed as instructed.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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