To Edit or Delete a promotion, click on the drop-down arrow to the top right corner of the card(s) in your promotions tab. Select 'Edit' or 'Archive' accordingly. You can edit the following information for an active promotion:
If you would like to change a promotion (i.e the item you are giving away or points required to get that item) you are basically creating a new promotion. Simply 'End' the current promotion and then tap the 'New Promotion' button.
Note that you can only edit particular section of a promotion so we don't impact the reporting of promotion.