In your UM Cloud installation you cannot just SSH into your machine and edit one of the familiar configuration files (cmsbs.properties, additional.attributes etc.) to update certain global settings, modify the data model or add custom CSE plugins.
...
env/test/cmsbs-conf/conf.d/env/staging/cmsbs-conf/conf.d/env/prod/cmsbs-conf/conf.d/
...
Adding and overwriting configuration files
...
REST endpoints
Cronjobs
Callbacks and Hooks
Backoffice Wizards
See Tutorials for examples of frequently used programming patterns.
...