Create a Buy "X" Receive "Y" Promotion

Shop > Promotions > Buy "X" Receive "Y" > Add 

Title - Insert the title of the promotion (your reference only)

Start Date - Use the toggles to set up the start date of this promotion

Start Time - Use the toggles to set up the start time of this promotion

End Date - Use the toggles to set up the end date of this promotion

End Time - Use the toggles to set up the end time of this promotion

Product - This is the product the customer needs to select for this promotion to apply for the customer

Gift Product - This is the gift product that is automatically added to the customers cart