Two kinds of notification, two places to set them
Zite can tell you about your work in two ways: in-app notifications (the bell at the top right on the web, and the bell in the mobile app) and email. Both are personal preferences: you set them for yourself, and they apply across all your projects.
The two settings live in different places:
What you are notified about is set under your avatar → Settings (the NOTIFICATIONS page).
Whether you also get those notifications by email is set under your avatar → Edit Profile → EMAIL.