The file cannot be located message appears because the files for those songs are no longer where they were when you added them to your iTunes Library. The message also suggests that the files were downloaded and that's why they are listed in your iTunes Library, but something has happened to those files since then.
So the question is did you move, rename or delete the file for the songs after adding them to your library, or rename the path to the files? If so, undo those changes.
Ignore the fact that iTunes takes you to a miscellaneous folder; look for them manually buy using the file manager on your computer. If you find them, make a note of where they are located and then go back into your iTunes Library and this time, navigate to that folder.