Just go to Setup > Staff and click on a staff member’s name. You can turn on email alerts by entering in an email address and define when they want to receive the alerts. Entering in a phone number will do the same for SMS (text message) alerts. You can also establish whether they receive alerts when clients book online and when other staff members schedule an appointment or make changes to an appointment. To include changes made by staff, just click on Alert Options and check the box next to Copy On Alerts to Other Providers.
Please note, when scheduling an appointment internally for yourself (as the provider), the system will not send out an alert since you are booking on your behalf.