As soon as you press the shutter button, your digital camera automatically embeds information into your photos. But you can also add your own info if you want. This includes simple things like a photo caption (that can appear onscreen when you display your photos in a slide show), or you can add notes to your photos for your personal use, either of which can be used to help you search for photos later.
First, click on the photo in the Media Browser that you want to add your own info to, and then from the Window menu, choose Properties to open the Properties palette (or you can use the keyboard shortcut Alt-Enter [Mac: Option-Return]).
This brings up the Properties palette. At ...