To launch the Metadata (IPTC) Info window, select a photo in a contact sheet. Either select the I button on the corner of the image ("i" for "info") or use the keyboard shortcut command-I (macOS) or control-I(Windows.)
The Metadata (IPTC) Info tool shows you a thumbnail preview of the selected image. You can add metadata to any field, and you can use variables and code replacements. Unlike the Metadata (IPTC) Template, you do not have to check a box. Anything you enter and save will be changed.
Under the thumbnail preview of the image, you will also see controls to help you navigate through the photos in your contact sheet and apply metadata individually.
Save & left and right arrows: Save metadata changes and move to the previous or next image
Left or right arrows: Move to the previous or next image without saving any changes
Save, Upload & arrow: Save changes, open the uploader dialog and move to the next image.