The client program is
ssh(1). The server program is
sshd(8).
You may use the client program without any prior configuration. e.g.:
$ ssh user@server
The server program needs to be configured to start on boot. The installation script asks you if you want sshd started automatically. If you did not reply "y" then you will have to start it manually, or configure it yourself in /etc/rc.conf or /etc/rc.conf.local.