Are you thinking of a watermark, where the text or image appears, or a name that is in the file data but does not show?
Elements software supports watermarks, see this tutorial.
Yes, a watermark. Thanks for the link to the video. I've been searching the Internet for ways to add a watermark in PSE. Very frustrating. The instructions vary depending on the version you have. One video was very complete in explaining how to do it via a custom brush. BUT, I couldn't find the bush the author was referring to. I have a Smart Brush, but not a "regular" brush.