Try this page:
https://support.chess.com/customer/portal/emails/new
Where it says "What do you need help with?" choose "Billing" and a page will appear with boxes into which you can enter your information.
payment charge
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hello I got a year platinum sub late last year I believe and I was charged about 7$ this month. is there a number or forum page I can contact admins for this type of things?an easier way of contacting, I dont know and dont have time to look more than I have.