How can I change my previous paypal account?

I can't pay via my new paypal account, because my old paypal account used by chess.com or something? Please help.

You probably have your old pay pal account listed as the preferred payment on the Chess.com account.  You probably need to go into your chess.com account and change information to new account... would be my quess.. ?

To change your chess.com payment preference... 

Put cursor on Home, then click ACCOUNT

go down to account purchases and history.... click it...

then directly below (in red text)... click here to update your billing information

then change your payment method...  

Yes I see that, but there is no option for paypal.

To change or cancel your agreement with Chess.com, log in to your PayPal account, go to your Profile, and click My money. Update your agreement in the "My preapproved payments" section.

OR MAYBE YOU HAVE ALREADY TRIED THIS... THUS BEING THE PROBLEM... EH?... 

Just trying to help...  Larry

Thanks for your all help Larry. I've just contacted chess.com support.