My payment details have been rejected because names don't match my account

My payment details have been rejected because names don't match my account.im use Payoneer account as a payment method and it rejected due to name not match with an account.

I'm new to pay per hour and I mistakenly use a nickname as my account name.

how I change my name?

need a proved document for it?

and how I can send it to you? extremely sorry and mistakenly done it.