The expire promotion function allows administrators to immediately expire a pending or active promotion before it has reached it's expiration date or maximum uses. To expire a promotion immediately, from the admin panel navigation click Promotions and then List Promotions. A data table with sorting tabs at the top will appear, locate the promotion you wish to expire and click the red Expire button.
If you wish to reactivate a previously expired promotion, you can change the End Date field under the Edit Promotions function. Take note that if you have set the max uses field (a value greater than zero), this may need to be adjusted to be more than the current uses of the promotion in order to activate the promotion again.