Paste Edits in Options page of Iphone 14 doesn't function. The icon is not dark or bold button and can't point for function. How can we do?

You need to edit the photos first, to get the Copy Edits and Paste Edit Options highlighted.

Please see the pic below which is self explanatory.

Copy and paste edits to multiple photos

1. Open the photo or video that contains the edits you want to copy.
2. Tap. , then tap Copy Edits.
3. Tap. to return to your library.
4. Tap Select, then tap the thumbnails of the photos you want to paste the edits onto. Or, open a single photo or video.
5. Tap. , then tap Paste Edits.

Edit photos and videos on iPhone - Apple Support (IN)