With a show and hide rule, you use one or more conditions to determine whether
to show or hide a field if the condition evaluates to true.
To set this example up, add these fields to a form:
I am 18 Years Old or Older, a required single selection field with two options:
Yes and No.
Legal Guardian Email Address, a text field that accepts valid email
addresses (use text field validation to dictate input type).
Show rules let you keep a field hidden until some condition is met.