Check if SSH is Installed

1. Open the Terminal application on your Mac.
2. Type ssh and press Enter.
3. If SSH is installed, you should see usage information for the SSH command. If not, you may need to install it. Make sure to search the web for your version and how to install SSH.
    

SSH Connection

1. Ensure you have the IP address or hostname of the remote device you want to connect to.
2. Also, ensure you have the username for the remote device.

To connect, use the command:

ssh username@remote_host

For example, if your username is user and the remote device's IP address is 192.168.1.100, you would type:

ssh user@192.168.1.100

3. Press Enter. The first time you connect, you'll be asked to confirm the connection by typing yes.
4. You can enter the password for the remote device's user when prompted.

Note:  Italics