How to edit EXIF and IPTC info directly in the Program Interface
The first method:

The second method:
1. Select a file and click "Edit EXIF/IPTC" (5).
The "Edit Properties" window will appear:

2. Now you can edit EXIF and IPTC data or remove the metadata from the respective fields, for example:

3. If you need to return to previous values, click the "Undo" button:

4. Click "OK" to save the edited metadata.
See also Batch-Editing EXIF data for a Group of Files...
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