When creating or editing a shift you can alert the person you're assigning the shift to by selecting the Notify option above the staff selection box.
The notifications are sent both as an in-app message and also via email.
Shift assigned - App notification
The app notifications are listed on the phones in the usual, on screen notifications section.
Example of an app notification:
Shift assigned - Email notification
The email will be sent to the staff member's email address.
Example of an email notification:
If the notifications aren't coming through please see these articles: