You can login to PayPal.com (make sure it's the website you're logging in) and then go to WALLET -> Link a card.
If the mobile browser you're using in accessing the website, kindly go to Menu->Wallet-> Link a card.
For creation of PayPal prepaid card account, kindly contact the number on the back of your card. Since it's prepaid PayPal card as what you mentioned, you need to create a PayPal prepaid profile for that but kindly do the instructions above first.
I hope i was able to at least help you out 🙂
