I already filed is it possible to change from mailing my check to reciving it direct deposit ?

Once your tax return refund has been accepted (or mailed), it's too late to change from receiving a paper check and instead having it direct deposited into your bank. 

Now, if your recently e-filed return is in pending status, wait to see if it is either accepted or rejected.

• If rejected, open your return in TurboTax and go through the File section again and ad your bank account before re-submitting your return with any applicable corrected information.
• If accepted, you'll get your refund via a paper check.