Anyone can give me some help about GetPaidTo?

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Hello, everyone! I just joined the GetPaidTo, I don't know how to earn, anyone can help me? and when I set Paypal paid, and input my paypal ID, it always said" An error has occured: please enter a valid paypal account Id,only 13 characters lenth AlphaNumeric characters only. I don't know why. But my paypal ID is ok and good for using others websites payment. Who knows, tell me how to solve this problem and how can I earn. Thanks very much, mylotters!