Min date and Max Date

I Want to add a validation that the user can only choose a date after 14 days from current date
And Ninja form in only allowing for start year and end year
Is there any solution for it?
I also check from old topics
“https://developer.ninjaforms.com/codex/datepicker/”
but it is 404 not found

The page I need help with: [log in to see the link]