Profiles in the consumer scale's cannot be removed (except for the BC-401 scale. Read how to delete a profile on the BC-401 scale here: How can I delete a user profile from my BC-401?). But they can be modified. To do this, you can follow the steps in the scale's instruction manual on the page 'how to set a profile'. The instruction manual of the scale can be downloaded from the product page on the website.
TANITA HQ in Japan has chosen this to ensure the quality of the scale. Because of this, the scales can never be sold second-hand as new.