how to remove the pin to awnser calls

[Superj235]

So when i got a call recently it showed me 4 numbers and i had to put a pin in. I forgot when i did this but now i want to turn it off.
I spent a half hour or so looking through all settings and still dont know how. Its an LG Leon. Its an Android.

pls help.

 

[webworkings]

Here is the user guide for that phone. https://www.metropcs.com/content/dam/mpcs/faqsandsupport/lg/LG-Leon-LTE-UserGuide.pdf