If you are referring to the top of the form where it says "For calendar  year 2023, or tax year beginning ....", the "or" in that sentence is referring to a fiscal year return. You can indicate a fiscal year return in Screen 1, Client Information, "Fiscal Year End (MM)". Once you make that entry, the fiscal year dates will print.

A calendar year return is the default, with no need to enter the dates.

There is also input in Screen 3.1, Misc. Info for short tax year dates.