1. You can modify an existing ad any moment and as many times as you need - Modifying an existing ad (other than renewal) is free of charge
2. To proceed, you'll need to log in as an Advertiser and reach the "Advertiser Maintenance Menu" page - Refer to topic "How to log in as an Advertiser" for steps for logging in
3. When you are on the "Advertiser Maintenance Menu" page, scroll down and reach the Edit/Renew Existing Ads section
4. From a list of all existing ads registered under your Username, locate the ad that you wish to modify
5. At the far right along the line of the ad listing, click on the option Edit - This will bring you to the "data entry form" of the existing ad
6. Edit/modify the ad and when you are done, scroll down to the bottom of the page and click on the "Submit" button to finish the process