Adding a photo to a Craigslist ad is easy. After you write your description, click on the button below the text box (the Add / Edit Images button). You should see four large red X's. You can add up to four photos. Click on the Browse... button to select a photo from your local hard drive. After selecting the photos, click on the Continue button. Keep in mind that large photos can take a LONG TIME to upload to Craigslist, so be patient. I sometimes just post one photo to get the ad going, then add more photos later. Hope this helps you.