Do you have a bank account or a credit card attached to the Paypal account?
Have you completed the verification process, which puts a tiny amount of money into your account, then you let PP know how much it was, then they remove it?
If not, wait until you have completed that process.
Meanwhile, use Contact Seller to let your seller know you are having problems. She can then either wait or send you a Mutual Cancellation.
Buyers cannot cancel transactions. Only sellers and they need the buyer's agreement.
