Unfortunately you can only use the Vanilla Visa prepaid card as a funding source to Send Money or make a purchase - it can't used to top off your PayPal Account Balance.
In general, prepaid cards are a challenge, you can link and confirm a prepaid card as long as it has the Visa or MC logo and you have registered both your name and address with the card issuer. Make sure that the name and address you use to register the card matches the name and address you used for your PayPal Account - else the card will be rejected.
