How to add an account in OneDrive - Microsoft Support
Open OneDrive settings (select the OneDrive cloud icon in your notification area, and then select the OneDrive Help and Settings icon then Settings .) Go to the Account tab. Select Add an account. Note: You can only have one personal account.
Applies To:
OneDrive (work or school), OneDrive (home or personal), OneDrive for Mac, OneDrive for Windows