How do I disable or turn off passcode protection for email accounts on iPhone six?

Thank you for your reply. However, my issue has nothing to do with parental control or restrictions and I am aware that email is not included in those. So, thank you again but this did not answer my question and I do still need help. I set the passcode protection because I have 4 emil accounts and 1 of them is work. But it has become a real pain in my neck and I now wish to undo the protection but can't figure out how...CAN ANYONE OUT THERE PLEASE HELP???Thanks so much.