Does any one knowes how to use paypal

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I recently got a payment from mylot a amount of 12$ i want to purchse a domain name from some site.They accept payment from paypal.Now waht i want is that the money that have earned should be given out to the website and not from my credit card.But as soon as i try to make any payment i dont get any option of paying from the balace i have in my apypal account.Only the way to purchse is through my credit card.Please can any1 tell me how can i really spend the money on paypal without actually paying through my credit card please i want o to know this any how ,please