Download the latest version of putty from
the
putty download page. You’ll want putty.exe from the
release version for Windows on Intel x86 section (direct
download link)
Put putty.exe somewhere in your $PATH,
I normally just use c:\windows
Run putty.exe
Fill in the “Host Name (or IP address)” field with the
username and hostname or IP address (eg username@hostname
or username@ipaddress): 
Make sure the Connection tye is set to SSH
Click the Open button. If it’s the first time connecting
to the host, you’ll see a dialog box like this:
If everything has gone well, you’ll connect as
username and be able to type in your password: 
You should now be connected to the server