To get to Profile Page Settings navigate to:
Core > Settings > Profile > Profile Page Settings, the information entered in E-mail Notifications Channel Settings appear in the "old" user profile's Email Notifications channel (Podium). Only Platform Managers see that information now. The E-mail Notifications Channel appears in the user profile via Core > Users/Access > Profile > Edit User Profile Data. This is the "old" Podium profile.
In the new profile, users can access notifications in by clicking on their name in the top-right and selecting Settings > Notifications.