How can I use the app lock in iPhone 6

[iMore Question]

I can't access the app lock
I can download it but it's not working
Can u please figure it out

 

[Tartarus]

Hi, welcome to iMore.
I don't know what App Lock is.
Is it an app you can download from the AppStore?

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[Ledsteplin]

What, exactly, does it do or not do?

 

[kaka sarkar]

Human