whatsappFF.js

var firstNameKey = "first_name"; // give your first name fields Name attributes
var lastNameKey = "last_name"; // give your last name fields Name attributes
var phoneNummber = "5521997832127" // give your mobile number
var text = "Quero-Desenhar%0A%20"; //give your texts

$form.on('submit',function(){
    var firstName = $(this).find("input[name='names["+firstNameKey+"]']").val();
    var lastName = $(this).find("input[name='names["+lastNameKey+"]']").val();
    window.location = 'http://api.whatsapp.com/send?phone='+phoneNummber+'&text='+text+''+firstName+'%20'+lastName;
});