How do I link my Fitbit account with my MyFitnessPal account?
First, you will need to create an account at the Fitbit website at https://www.fitbit.com/signup
Once you have created your Fitbit account, login to your MyFitnessPal account and visit this link http://www.myfitnesspal.com/apps/show/30 and click "Link Accounts"
You will be taken to a page at fitbit.com where you can authorize the connection between your MyFitnessPal account and your Fitibt account. (If you are not already logged in at fitbit.com, you will need to log in before you can complete the authorization).