I paid twice for filing my taxes, how do I request a refund from turbo tax ??

you will get a receipt on your tax page on the bottom right side and you can contact support but usually the credit will be recredit you your account it jutts might take a while for that !

If you are seeing two identical charges, one of them may be a temporary authorization as opposed to an actual charge or debit. You can check with your financial institution to be sure. 
Please see this FAQ: Why was I double-charged or billed twice? for more information and how to contact us with questions.