If you did not request a Direct Deposit when filing the amended return, then you will receive a refund check in the mail sent to the address on the amended return. You cannot change the method of receiving a refund after the return has been filed and accepted.
If you requested a direct deposit and the IRS changed to sending a check you cannot request a different method of receiving the refund for the amended return.
A Form 8888 cannot be used with an amended tax return.