If you have some ads that are underperforming, you may want to edit your creatives.
Once you are in your campaign's Dashboard, click on the All Ads tab. If you click on Expand all, all your ads will be visible.
Select the Ad you wish to edit and click on the Edit Creative button
...and you will be prompted with the editing tool.
Make the changes you need, and click on the proceed button.
Now you will be asked if you wish to edit this single ad, or all the ads that had the same traits you have just changed.
In this case, I changed the picture of the ad, and since there is another Ad in the campaign that was using the same picture, AdEspresso is asking me if I want to also change the picture in other ad.
We always suggest that you update all the ads involved (the green button!) so you can keep testing a uniformed design that will allow you to see the results for the new picture more quickly.
Click on your choice, and after a moment your changes will be applies. You are done!