You can link your Grey US, UK, or EU bank accounts to Skrill; here's a guide.
Log into your Skrill account.
You can head over to the Withdraw section.
Click on Add a bank Account and enter your Grey account details.
You may be asked to verify your bank account; you can learn how to do this here.
Once you have successfully linked your account, you can withdraw from Skrill to your Grey account.
Note
Your withdrawal will fail if your Skrill account's name does not match your bank account's name. Withdrawals on Skrill are only allowed to a personal bank account, and any withdrawal to a third-party bank account will fail.