When running the installer to install Blueriq Studio (Installing Blueriq), 3 users are created:
admin
runtime
administationpage
Please make sure to change the default password during installation.
After the typical / custom installation the users are stored locally. Although the credentials are encrypted within Studio, it is advisable to authenticate against an Active Directory instead. This way managing users is done outside Blueriq and you have more control over password and lockout policies. Also the passwords are stored in the Active Directory and not within Studio.
To install or change Blueriq Studio security and user management, please read this article: Studio Configuration
Since Blueriq 9.7 we've added Kerberos support which is the prefered protocol by Microsoft over NTLM: Kerberos support