Users can be configured by authorized users in the User Management tab of the Botium.
You can create new users and either give them an initial password, or immediately send out an email for the users to choose their own password.
If users have to choose a password, the policies can be configured in the Password Policy view of the System Settings
Minimum length of the password
Wether digits, special characters and/or lower/upper case characters are required
Expiration days (user will be forced to choose a new password)