How do i sign a tax form?

[mquittley]

How do I sign an E File?

[fanfare]

when you e-File, your return is presumed to be signed.

[Critter-3]

If you need to hand someone a signed copy of your return then print it out and ink sign the form1040.  An efiled return used your self selected PIN to "sign"  the return ... no ink signature was required when you agreed to efile the return.