How to lock sim pin on i5s Verizon phone that I changed to straighttalk?

[1Dumbass]

I have a Verizon I 5S and switched over to straight talk on Verizon towers but I can't seem to lock the Sim card. Can anybody help me with this ?

 

[hang-the-9]

Instructions are here https://support.apple.com/en-us/HT201529 If that does not work, you'd have to contact support either for Apple or Straight Talk.