Help Line password problem

[spman]

In line app, I followed "Creating a password" guide and created a password using the steps at Help center | LINE

What does the password do? Where to apply the password?

Why whenever I tap once to open the app, it does not require any password?

How to set a lock screen on line app to request for password/fingerprint?

Thanks

 

[spman]

update. I only need to ask first question. I solved my last 2 questions by following this video

 

[NightAngel79]

Not familiar with that app, but I'm guessing that is more of an app support question, unless someone here is familiar with this app?