How can I setup an unprivileged (non root) user?

[balding_parrot]

This is not supported by us.

IF you still want to do this, look into the two commands:
adduser
useradd
But please be aware that we will not support you or any problems you encounter doing this or after you have done this.

Remember, BT is not designed to be an everyday distro and is designed to be run as root which many of the tools require to function correctly.