If you want to change the main user of your account, perform the following steps:
- Log out from the Withings Health Mate™ app and then log back in.
- When a popup prompts you to select your profile, tap the name of the user you want as the main user.
The user you've selected is now displayed first in the menu. Note that only the main user has a Timeline, a Leaderboard and the ability to set reminders.