Do not modify ads that have already been approved by ad services.

Remember that once a Google AdWords approves and advertisement, that ad is syndicated on partner sites, such as AOL. If you modify an ad, it is considered a new ad and must be approved once again by the Google AdWords office. While this process is taking place, your ad will not be listed on partner sites. Moreover, the approved modified ad will be treated as a new ad, so the ad history will be deleted. Avoid needing to modify ads by crafting and editing them carefully. If you want to add new information to an advertisement, create a new ad to run in tandem with the original ad. If your ad has become obsolete for some reason, pause or delete it altogether.