This support request is being escalated to our root admins who can grant remote access.
Remote access to PostgreSQL is not granted by default, but an admin can set it up on request. Please refer to the detailed troubleshooting page here for a longer explanation: https://wiki.helionet.org/common-errors/postgres-remote-connection-error
If you wanted to enable remote access yourself, you'd need to use a MariaDB database, where you can grant the remote access rights when you create the DB.