Thanks for your answer.
But how can I use a root user? I thought, that if I log in with "Bitnami" user, I'm a root user?
Because also I need to enter this command in ssh console to install the xblock( info from https://docs.bitnami.com/google/apps/edx/):
* Install the XBlock using pip: pip install /path/to/downloaded/xblock/
But I don't have permission for it.
So if I'm right, I should have an access as a root user.
Or if I want to install stanford theme, I also could not do this.
Thanks in advance!