The Pairing Code is a unique number generated by our uKnowKids Relay software to make sure your child's data goes to your dashboard. Kind of like a Post Office Box.
Install uKnowKids Relay app and get the pairing code.
If you would like the full version of the setup instructions for iTunes please try the following link.
How Do I Connect My Child's iPhone to uKnowKids with Apple iTunes?
I might also suggest some best practices for you when using iTunes and uKnowKids.
Getting started with iTunes. Tips for early success