I donīt understand why people have problems with the Verified by Visa system ...
Just call the bank that issues your card.
They are the ones to set up this additional security level.
My Visa card is from a German bank and it was a very straight forward process (online at my CC account / less than 5 mins) to "upgrade" to the verified by VISA level.
You need to provide your mobile number (canīt remember if there were other options) to which VISA will send the code as a text message every time a code is requested. This code is valid for 10 mins only. If you wait too long you need a new one ...
Thereīs no such thing like a single "PIN" for verified by VISA !
Your card may well have a PIN but it is irrelevant for the verified by VISA process because you get a new code for every transaction.
Make sure you donīt block pop ups because some websites generate a pop-up to enter this code during the payment process.
Never had any problems with the verified by VISA system so far !