For Windows users see the following link
https://blogs.oracle.com/cloud-infrastructure/simple-console-connections-for-windows-administrators
Linux users run the following command
ssh-keygen -t rsa -N "" -b 2048 -C "<key_name>" -f <path/root_name>
Once you have your keys, you should upload them to the Appliance by going to options → hypervisor settings → configured hypervisors → oracle cloud → Manage SSH Keys