Top row of buttons allows you to apply an action to all image tags. Action buttons as follows:
Save all - Saves all the original image tags. Values of the fields on this window are ignored.
Save all and replace - Saves all the original image tags. Tags values of this screen depend on the settings for each of them individually (three buttons on the left).
Delete all - Will remove all image tags, not just those that are shown on this window. That is photo will not contain EXIF tags at all.
Set only next - Will remove all tags except where noted on this window.
Buttons Save original text, Replace original text and Delete original text are responsible for individual fields. In the Step by step mode you will have the opportunity to change their status for each image separately.
In the Related file tag it can be written the path to the file with the audio commentary. File must be created before this.
You can set the existing tag values. Click ... button and a list of values for the appropriate tag from the photos in the destination folder will be opened.