Use btadmin to add more administrators:
This utility creates a record in btpasswd for user
username with password
password (if option
-p is not used, then you will be asked to enter a password). If a user already exists, then his password is changed as specified.
By default a user is created without administration permissions. You can use the a+ option to give administration rights to the user. You can remove this right by using
a-.
Every time the btpasswd file is changed, the previous version is backed up to
btpasswd-.