Go to Booking →settings → Discounts
Click on new discounts
Enter the Discount code
Set it active
Set it it’s one time service
Specify if the discount will be a fixed amount or percentage
Add the amount or percentage
Make it stackable with frequency discounts
Set a maximum number of uses
Set an expiration date
Allow customers after a specified date
Set a service start date and end date
Specify which days of the week the discount will be applicable
Click create
Go to Booking →settings → discounts
Select a discount code and click the edit icon
Change what you must and click update
Go to Booking →settings → discounts
Select a Discount code and click the delete icon