What happens when you try? What is the complete, exact, word-for-word error message?
Are these photos JPG or RAW? Which Nikon camera? Which version of LR 5?
Cannot import files cannot be read
RAW and Jpeg images from Nikon 800e and D600, on iMac with LR5.7, iPhoto works
Both cameras are supported by LR5.7
files cannot be read
This means that the destination folder, where the photos are supposed to be copied into, does not have Read&Write permission. Change your permissions!
cannot find any where in destination folder to give permission
Folder permission is changed in your operating system.
Go to your favorite search engine and type in
change permissions MAC