I have light room and I have Photoshop I use a iMac OS El Capitan, 10.11.3 with 32 gigs of memory and 3.1 terabytes of Storage. I'm trying to import the photos that I've stored in Macintosh Photos app and while I do find the app it's grayed out and I cannot select. Now the directions also asked me if I wanted to import Facebook Photos, I said yes, it seemed to except that command activated so it may be busy importing those and then I can re-access the photos app. I am in Novice, I had no problem with Macintoshes iPhoto application I didn't like the aperture Application and currently I'm using photos Application. Honestly I really don't know what I'm doing.
Lightroom and Photos do not play well together. If you want these photos in Lightroom, you must first go to Photos and export the selected photos to a folder in your Pictures gallery. Then you can open LR and import these photos from that folder.