Create a Rule to Validate a Field
Let's take a look at how to create a rule that works like the example above, displaying a message in a form when the value for the Head Count field is over 1000.
To create the validation rule:
To add a different message to the rule, say a message with different text displayed under a different field, click + Message to create a new message and specify its details.
To check if your rule is working, view the page in Live mode and test the form by entering values to trigger the rule.