I don´t know about a HowTo. Neither I have need one!
Search Google for PUTTY. Download it. It´s freeware
Run putty and put your ip server as Host. Choose SSH at right.
Write a name for your server (e.g. "linux server") and click on save.
Now use open button to connect and answer with root and his password!
If you wanna to access from outside SSH use port 22. So open a hole in your firewall and/or redirect ports on modem!
If you need more help just ask!
Jáder