How to Delete Norton Family App from child's iphone 5S

Hi -- I put norton family on my child's phone, but then it wasn't allowing us to delete apps.  I couldn't figure it out, so I decided to delete norton family from his phone, delete the apps he wanted off (to make room on his phone), and then reinstall.  Online I deleted the device and there was a message saying to make sure you delete the app off of his phone also.  I can't figure out how to do that.  HELP!!!!!!!!