Note : i created a paybal account today
How to get Diamond trial for 10 days free

The free trial requires no payment, only an identity verification (to stop people taking the trial, over and over again), so I don't know why you would require a paypal account or an address to send money to.
I suspect that you are confused, please take a screen shot/snip or post a link.
p.s. You could pay for diamond membership, via paypal or the address, and cancel before thirty days have elapsed.

Reading through some of this:
http://www.chess.com/forum/search?keyword=free+10+day+trial
It would appear that the 10 day trial is only available for those with a credit/debit card.
How to get Diamond trial for 10 days free
i have not a credit card
But i saw that part on the page of the Diamond plan trial
How can I signup if I don't have a credit card?
If you don't have a credit card you can use the Paypal option on the checkout page. You can also send a check or money order to Chess.com, PO Box 60400, Palo Alto, CA 94306
so any one can help me ?
and sorry for my bad enligsh