Account-holders can edit their user preferences from within the web application.
Once logged in, click on the "Settings" tab/gear icon located in the bottom left of your screen, then click on your email address. This will bring you to your Profile page.
Click on "edit" to open up the page where you can update your email, as well as pick and choose what notifications you would like to receive. Once you check (or uncheck!) your desired preferences, click "Submit" to save your changes.