@tigerstar you'd need to add a new device on an existing account via your computer or mobile device.
You have a Blaze? Here is the link to the user manual and related articles.
Let us know what happens.
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Welcome to the Forums @tigerstar!
Thanks for sharing your inquiry, let me hep you out. If you're trying to setup your Fitbit using a computer, you'll have to do it using the Fitbit Connect software I recommend checking the instructions listed on this article. If you want to use a mobile device I recommend checking first the compatible devices list.
Keep me posted!
Moderator edit: Updated subject for clarity