Start by logging into your account at www.fit3d.com
You'll be taken immediately to your user platform. Click on REVIEW MY WELLNESS
Then choose BODY COMPOSITION on the next screen...
On the following page, click the pencil button to edit, enter the correct value and click the check mark to save.
After that, all should be right as rain! Data saved and now you can get back to checking out your 3D avatar.
All the best to you from the crew!