i could't add m4r format to itune

the song converted to i phone ringtones supporting format i could't able to add to the i tunes

I tried adding several ways - drag and drop; import; copying file to itunes folders, including auto add folder; etc. Nothing works. It shows a plus sign and acts like it's about to add it, but it doesn't show up. I can play the file, just can't add it. I shortened it to 29 seconds. I tried editing the info to fill in the artist etc, but I am unable to access those fields. I can see them, just can't type in them. I tried adding someone elses m4r file and it did the same thing. How do I get this to work?

Thanks.