How do I select a PIN for the Card?

While a PIN is not required to use your Card, for your convenience, you may add a PIN to your Card. Simply select a 4-digit PIN of your choice during your first debit, or PIN, transaction. The PIN that you enter at the register will be your PIN for all future PIN transactions.
What do I do if I forget my PIN?

Don't worry; your Card can always be used for credit transactions without a PIN. But, if you would like to clear your PIN, you may do so by calling the customer service number on the back of your Card or by logging into this website with your Card number and choosing "Manage PIN". Once you have cleared your PIN, you will need to select a new 4-digit PIN of your choice during the next use of your card for a PIN transaction.

https://www.vanillavisa.com/faq.html