1) Once logged into your account, click on the Flyer tab in Cloud CMA.
2) Click Edit on the Flyer in question.
3) Click Listing on the Black bar.
4) Make the changes you want in the Description Box. Once finished, click Update.
5) Click Publish on black bar to show the changes.
NOTE - For the description to show on your flyer, you must use layout 1-6. That can be changed in the Customize Step.