How do i change my bank info from last year before i efile?

HOW TO CHANGE OR ENTER BANKING INFORMATION FOR REFUND

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/change-transferred-direct-deposit-information/L77NCbU6D_US_en_US?uid=m6tuh572

You cannot  change banking information while your return is in pending, nor can you change it after the return is accepted.  The IRS does not allow it.

Click on File on the left side of the online program screen.  On Step 2 if you have a tax refund, select Direct Deposit.  On the following the screen you can edit your ban information.