In order to use notifications in Keywin 6, you need to go to Settings tab->SMTP and fill out the values for your own SMTP service. If you want us to activate Creones SMTP service we need your sitename and password so we can log in and set the values for you.
Here is the general instructions:
You need to tick the active button
You need to set a username and password of the user that is licensed for the SMTP service and that owns the email you want to use
You need to set a port (587 or 25 is the most common for encrypted traffic)
You need to tick the SSL button if that is requested for your SMTP provider
Then go to settings->notifications and set up the users that will receive the email alerts and you can test your setup.