How do I sign a joint tax return has husband has passed away?

[Anonymous_]

See https://www.irs.gov/faqs/irs-procedures/signing-the-return/signing-the-return

[Critter-3]

If you indicated you were filing a joint return with a deceased spouse the program would have already indicated that and  you may not be able to efile the return with a deceased spouse on it ... the IRS will probably reject any return you try to efile.