You can add a photo title, description, and the date and time a photo was taken, if your camera didn’t record it. (Your camera also assigns each photo a filename, which you can’t change.)
Important: Editing a photo’s information changes it in the photo library and in all albums, projects, and slideshows where it appears.
To change a photo’s information:
Select the photo.
Click the Info button.
Click the title or description field, and then type the new information.
Tip: To change the title, date, or description for multiple photos at once, select the photos and choose Photos > Batch Change. Then choose your options from the pop-up menus and click OK.