NAIM setup on iPad

I had to totally rebuild my wife’s iPad and as a result of doing this she has the NAIM app but no NAIM devices . We have three NAIM Unitis. How do I recover the situation so that she can access all of the devices? I have them all accessible on my iPad.

Click the + symbol at the top.right to add devices and it will guide you

Thank you. I will try that.