Once you're in "Account Settings", look to the right of the user box containing your account information, and click on "Notification Settings" as highlighted in the green box:
By clicking on the globe icon in the userbar, and then "Notification Settings".
Once you're in there, make any changes you deem necessary and click save; it doesn't matter which 'Save' button you click on. See the introduction post for defaults, options, and explanations.
If you need more help on the subject, please don't hesitate to ask any of our staff. Happy Dreaming!