Publish:
  1. Create a new Hard Drive Publish Service
  2. Back in Lightroom Library module, locate your newly created iPhone Publishing Service
  3. In iTunes, Connect your iPhone device
The default folder created when you created the Hard Drive Publish Service for the iPhone in Lightroom will be a static folder. I usually ignore this since it is also a parent folder for any additional collections(folders) that you create along side. I like to create Smart Folder/Collections since I can auto populate the se and manage adding or removing images via Smart Collection criteris and then only need to hit the {Publish} button in LR to prepare the iPhones Publish folder for the next time I sync with iTunes