To change your notification settings, log in and click on "notifications" from the left-hand menu bar.

On your notifications page, click on the settings icon on the right side of the page, just below your initials.

You'll see this popup next, which allows you to toggle on or off any notification. Note that these settings only apply to email notifications, and you will still receive in-product notifications.

After you update a notification, your preferences will be automatically saved right away. Close the popup by clicking the red X icon in the upper right corner.