I need to file by mail because of an Underpayment. The printed tax forms have no page 2 of he 1040 and therefore no place to sign.

I can't e-file due to an Underpayment.  But after going through the whole TurboTax, my final return (both electronically and when I print) has no page 2 of the 1040.  I can't create a page two and so I see no place for me and my spouse to sign before mailing the hard copy.