"Declined" means exactly that; the card issuing bank declined to authorize the transaction. Make sure you're entering the card number, expiry date, CVV code, and billing address correctly, and we'd advise using a card which is not already linked to a PayPal account.
If you have further questions, contact PayPal support at 888-221-1161, which should get you to a better tier of support more acquainted with E-junkie than their regular front-line customer service agents.
