The Fitbit Community is a gathering place for real people who wish to exchange ideas, solutions, tips, techniques, and insight about the Fitbit products and services they love. By joining our Community, you agree to uphold these guidelines, so please take a moment to look them over.
Assuming phone app, from Today' page, tap profile pic in upper left to get to 'Account' page. Scroll down to 'Set up a Device' and follow prompts from there.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.