@GMC22 Hi, I've had to do that this week as received my replacement.
After reading many posts, I found the following to work (Im using an Android smart phone btw) -
Sync your account so it is up to date as possible. Go into the fitbit app, devices, select your current/old device and delete/remove it.
Once that is done, I plugged my new fitbit in to my pc (for charge purposes so plugging it in to a power source in general should work), i then went back to phone, fitbit app, devices and Add, selected my device, you then have to hold and press for 3 seconds the button on the HR - it tells you to do this - (this is why its better to have it plugged in at this point). If it isnt plugged in then it will just activate exercise mode when that button is pressed and held, but if its plugged in charging, then it will show you the code which your phone tells you to enter when its searched for it (make sure your bluebooth on phone is on!). Enter the code, follow the steps then it will be registering for a couple of minutes, so I just left mine to it. The reason I knew it had finished registering successfully was the clock updated itself to the actual time (which I happened to notice) and obviously if you look at your phone it will have gone to the next stage.
Let it sync a couple of times and it should be fine to use after that. Had mine a few days now (replacement that is, my other one lasted almost a year and then the strap got the bubble curse) and all seems ok, the app stores all your historic data (the fitbit can only remember 3 days of data, which is why its good to sync at least once a day).
Hope that helps/makes sense!
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