•  Choose Sales and Coupons sub menu.
•  Add new coupon.  Fill in the fields with fixed price or percentage.  Then choose type:  

Once - This coupon will only work for the first month
Forever - This coupon will work forever.
Repeating - This coupon has a duration field.  Enter the number of months you would like for the coupon to repeat in the duration field.

•  Once all fields are completed choose Create New Coupon.

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