You need to save them with a file name that you can retrieve later when you go to post them. My photos in Picasa are all arranged by the date I took them, so each day that I do my photographs has a separate folder. Then when I edit a photograph, I "Save As .....". I usually save my five pictures as a1, a2, a3, and so on, and then when I want to post them, I go to that day's folder, and they are right there waiting for me. I have tried saving them just using "Save", but the same thing happened as is happening to you - my edits would either disappear or I just couldn't locate the edited picture again! Picasa is a very user-friendly editing tool, but it still takes a little time and some practice to get it working the way you want it to. Like anything worthwhile, it takes time to learn. I found the best way was to take tons of pictures and then I had plenty of material to experiment with using Picasa. I know there are a lot of people out there that like other types of editiing programs, but Picasa is easy and free -