I know there is one person out there that may not know this, so I will share.
You you ask, how does one log into a remote Linux (UNIX) system using SSH. Well the answer is simple.
If you are on a Linux (UNIX) system, open your terminal and use the following command:
ssh userid@server-ip (1.2.3.4)
ssh userid@server-name.something
Note: userid means ‘your user name’
If you are using windows you can use an app named Putty