1. While in the Promoter tool, you can access your Ad Library from the top right-hand corner of the Campaigns list.
2. Clicking on this should bring up a list of all ads in your system, you can then click on any ad on the left hand side to bring up a preview, and select the pencil on the preview to edit the ad.
3. Once edited, you can see all customized adds by selecting "My Custom Content" from the drop-down menu as seen below and you should see a list of all created and customized ads.