After selecting a field, press the Field Validator option on the object insertion toolbar or through the menu.
When selecting a validation rule, a text box will be available for you to enter an error message that will be shown when the field value does not meet the validation rule.
The available operators are: , which should be chosen if at least one element of the group must be selected in order to be valid.
Once the operator has been chosen, you must select all the fields that are participating in the validation.
The submit event is selected and disabled: this is normal, as the validation rules are always checked when the form attempts to send captured data to the server.
If some of the validation rules are not met, the information is not sent through.