Want to use PIN number

I had been using a PIN for logging in and all at once I have to use my Windows password. I went into
sign-in Options and tried to enter a PIN and I get a screen saying: Making Sure It's You. It's asking me for my PIN and when I put it in nothing happens. I don't see where I can delete my old PIN and then add another one.

Maybe this guide by Brink will help.

Change PIN for your Account in Windows 10

I have gone to that screen a number of times and I do not get the screen shown in the tutorial. I do not get the "change" by the PIN, all I get is ADD. I click on that and the "Making sure it's you" wanting my PIN. I add the PIN number I had been using and nothing happens.