To update the email alert notifications for your Crunchbase account, click on your account in the upper right hand corner, then select Account Settings.
Here, under Account Information, click on the Notifications box. A box regarding your notification settings will appear prompting you to update your settings.
To turn these notifications on for a specific item, slide the button for that notification to the right. To turn off notifications off for a specific item, slide the button for that notification setting to the left.