Tagging TIFF-files in Photoshop Elements 5

Question

I'am still using Photoshop Elements 5, but the organizer refuses to tag my TIF-files from a Nikon  D 300 (tagging JPEG's is no problem).  Because I would like to continue saving my edited pictures as TIFF-files, I would be glad, if anybody could give me a hint how to manage this problem.

Answer 1

1) NEF (RAW) + JPEG Fine. I load the NEF-file with the Editor into this opening frame (don't know it's name). After treating the picture there I choose "Open picture" (translated from German) and continue treating the picture with the Editor. At last I save it as a TIFF- or an JPEG-file.
2) Yes
3) After drawing the icon with the tag to the picture it is to be seen for about three seconds. If I choose a new category, this icon appears below the picture.
After this I choose "Save the tag- and featurecharacteristics with the photo" (translated from German) and get the answer: "The tag- and featurecharacteristics have been written into the file metadata" (translated from German).
If I load the photo/file into the Editor, there are tags/keywords within the files I before saved as JPEGs and no tags/keywords within the the files I before saved as TIFFs.