After a container has been started you can upload files and edit configuration files via SSH/SFTP.
When connected to a container through SSH you can navigate to the
/container/config/ folder which houses the config files for the applications running in a container.
supervisord.conf - This file contains the information used to describe how to run the service like the user and the command to start the application.
Service Config File - This file will be named the same as your service (e.g. mongodb.conf) and will contain all the config for your application.
After editing either file you will need to restart the container through the control panel to apply your changes.
The standard output messages should be logged to the path:
The standard error stream should be logged to the file located at: