How to export Lightroom CC albums to iPhoto on my MacBook

First ask of course why you would want to do this. If you want to see your images on a mobile device, just use Lightroom CC there. All your images will show up just like on your desktop. But if you really want to get your images into Photos (iPhoto doesn't exist anymore and is no longer supported by Apple so you are probably referring to the Photos app which is what Apple renamed iPhoto to) what you do is go into one of your albums in Lightroom CC, select all the images in there (command A) and hit the little share button at the upper right (the square with an arrow going out of it). There select "Save To". In the dialog you will get, select jpeg as the file type, set the size to full size, and select a location. Typically you will want to create a folder with the same name as your album. Let Lightroom export and when finished, go the new folder and drag it onto the Photos app. Photos should import all the photos and you should put them into an album in Photos.