In fact it's very easy to install OpenSSH in Linux.
To install OpenSSH enter: "sudo apt-get install openssh-server openssh-client" (without "")
To start the SSH Server enter: "sudo /etc/init.d/ssh start"
To close the SSH Server enter:"sudo /etc/init.d/ssh stop"
And at last to restart the SSH Server enter:"sudo /etc/init.d/ssh restart"
To access to your SSH Server for example from Windows, you can download a little tool, called "Putty".
PS: I used Ubuntu to install SSH.