New to fitbit please help

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OK. So my fitbit is coming Tuesday and Im nervous for some reason. I just found out what TDEE was...so do I somehow have to give that to fitbit? I really dont even know how to enter the information to find out what it is.

So I wear it all the time so even when I am doing my Zumba, and I am not supposed to enter when I work out? I am trying to read as much as possible.

It sounds easy but hopefully when I get it, I will understand what to do.

Amanda