How do i obtain a signed copy of my return for bank purposes?

Simply print it and take a pen & sign it.   When you efile there is no signature on the forms.

TurboTax's instructions for printing and accessing current and prior returns are...

• For on-line returns, presented here https://ttlc.intuit.com/questions/1900748
• For download/cd prepared returns here https://ttlc.intuit.com/questions/1900639