OpenSSH is included on Linux, macOS, and Windows Subsystem for Linux. You need to use a terminal on a Linux, macOS, or Windows computer to connect to your Instances with SSH.

To connect to the Remote Desktop via SSH, follow the steps below:

1. Open the terminal and use the following command and enter the IP address of an Instance.

   ssh root@203.0.113.0

   Note: For most of the operating systems (Ubuntu and CentOS), the username is root.
2. When you log in the first time, the server isn’t identified on your local machine, so you will be prompted with the following message: 

   The authenticity of host '203.0.113.0 (203.0.113.0)' can't be established.
   ECDSA key fingerprint is
   SHA256:IcLk6dLi+0yTOB6d7x1GMgExamplewZ2BuMn5/I5Jvo.

3. Type yes and then press ENTER to continue.

   Are you sure you want to continue connecting (yes/no)? yes

4. As a host key is saved to your local machine, you will receive the following confirmation:

   Warning: Permanently added '203.0.113.0' (ECDSA) to the list of known hosts

5. In the authentication process, you will be connected to your Instance instantly if you already have added SSH keys.

6. In case you didn’t add your SSH keys, you will be asked for your password with the following command:

   root@203.0.113.0's password:

7. Enter the password and press ENTER.