You don't.  AFAIK, ProConnect is not programmed to print a date.

If the return is to be e-filed, all dates are on the F.8879.

If the return is to be filed on paper, you'd handwrite it on the form.

@PhoebeRoberts Those date fields wouldn't work for the signature line for preparer.  Those dates will only show up on the client letter.

Bummer. Lacerte will print the date for me, at least on most of the signature lines.