You'll need an account with us (its free). Just login to your account and browse for a particular ad. When an ad comes up that you want to save, in the lower left part of the ad page is a Utilities box. In that box is a Favorite icon/link. You can then view your saved ads in your Account Dashboard, and return to them if you'd like. Keep in mind that a seller can delete their ad, so if you need to save a permanent copy you might want to print the ad.