Explanation/Reference:
To confirm remote access to the database through the SQL*Net security rule, create a connection to the database in Oracle SQL Developer. When creating the connection, fill out the fields as follows:
Username: enter SYSTEM.

Password: enter Pa55_WoRd.

Hostname: enter the Public IP address of the compute node associated with the database deployment.

To find out this address, display details of the service as described in Viewing Detailed Information for a Database Deployment
Port: enter 1521.

SID: enter ORCL.

After entering values, click Test to test the connection.
Note: TCPS is TCP/IP with SSL.
References: Using Oracle Database Cloud Service (February 2017), 4-24
https://docs.oracle.com/en/cloud/paas/database-dbaas-cloud/csdbi/using-oracle-database-cloud- service.pdf