1. Click on the "Settings" icon and then "Custom Fields" 

2. Click the "Add Appointment Custom Field"

A box that looks like this 

should pop up enabling you to create a custom field and lets you choose if you want it to be in checkbox type, dropdown or text. And then hit "Create Field". You can also edit or delete the fields you made under the Actions column

All the changes made will reflect on the "Notes and Custom Fields" under the "Add New Employees" page

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