If you have the SSH access enabled for your account already you should use the following settings for your PuTTy application:
Host Name (or IP address): (here you should enter your domain name for example:) domain.com
Port: 16969 (This is the default port for logging using SSH for all of the server in our network)
Next you will have to make sure that the option SSH is selected and you will have to press the open button.
When the connection is opened you will have to enter a username which is your cPanel username for the domain to which you want to connect. The same conditions is for the password aswell.