My tax docs don't appear signed and my prospective landlord won't accept them. How do I obtain the one with the digital signature? Thank you!

You print out your return and sign it yourself in ink.

there is in fact no signature on an efiled return. what is referred to as an electronic signature is certain info transmitted to IRS such as prior year AGI which allows verification that it is really you filing. .       do as stated above,  print out sign and date,