First, you go up to your user name at the top. Click on 'my account.' Click on the 'profile' tab across the top of that page. Click 'email settings' on the left of that page. You will probably have to type in the answer to the security questions to gain access to the settings. Once you answered the security question, the page will display the notification settings for a variety of scenarios so you can select when you want hubpages to send you an email.
Hope this helps! :)