To use the SSH client on MacOS, you need:
Open Terminal
You can do this through Spotlight by pressing Cmd + Space and typing Terminal in the search bar
In Terminal, type a command of the form: ssh username@ip.address
In place of username you need to specify the account name, and in place of ip.address - the IP address or hostname of your server.
Press the Enter button.
if this is the first time you have connected to this device, a message will warn you that the server key is not cached in the registry. Enter "Yes" and press Enter.
Enter the account password.
** For security reasons, the password you enter is not shown as characters on the screen
To reset the SSH connection, simply type exit or close the Terminal completely.