Complete steps to install a free keylogger on an iPhone 4S not jailbroken?

I'm trying to install a free keylogger on an iPhone 4S I have absolutely no idea about cell phones or computer smarts, so if you could make this as discriptive as possible that would be great, I need the steps from websites to use to links to click on and how to get it on the phone once it is downloaded, and how to hide it would be great because this is for my kids and they are technology smart, so if anyone has any idea how to do this that would be highly appreciated thanks!

I'm afraid you can't install any third-party app let alone a monitoring program on the phone if it is not jailbroken. If you do not want others to find out your phone is jailbroken and there's a monitoring software installed on it, I suggest you apply an app like ikeymonitor. It is able to hide all the jailbreak info so that no one else will find out the truth.

https://ikeymonitor.com/

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