I made a simple 4 digit password to lock Notes.

I can't remember when I did it, or how change it to a longer one?

I googled and it seems the only way on phone? settings. confusing. says reset password. I did that, but did not work?

Is that resettting my apple ID? Totally confusing. Thankfully is did not do that. I'm not sure what it did, but I still don't know how to change notes password.