This is an old revision of the document!
https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
Once you have installed PuTTY then to SSH in first run it.
Once it runs enter your Hostname/ip address in the first field. For example user123@shell.ircnow.org
Everything else is already set. Click “Open” button after that and enter your password when it prompts.