Because SSH is based on a Unix shell, standard Unix commands can be used to view, modify, and transfer files from a remote machine once an SSH connection has been established. These commands can either be entered manually using a terminal emulator, or may be sent from a program with a graphical user interface (GUI). This type of program translates user actions, such as opening a folder, to Unix commands (cd [folder name]).
To log into a server using SSH from a terminal program, type: ssh [servername] -l [username].
The "-l" indicates you are logging in with a username, which is required by most SSH connections (otherwise, it wouldn't be very secure). If the login name is recognized, you will be prompted to enter a password. If the password is correct, your SSH connection will be established. To end the SSH session, type "exit" followed by the Enter key.