Click the Test 
icon 
to display your form in “Use Mode”—in other words, the form will appear and behave exactly as it will when users access it. To test the form, just complete it as your users would and click Submit.
Each time you supply a value in a control, sends an asynchronous request to the server to validate the data. This means users do not have to complete the entire form before discovering data was entered incorrectly—try to type letters in a number control, for example, and you’ll immediately see an error message. And, if your form includes rules that are associated with a particular control, the server will apply these rules as soon as users enter data in the control. For example, perhaps your form has a rule that enables the “Guest Name” control when you select the Yes radio button in the “Are You Bringing a Guest?” control. In this case the Guest Name control will be enabled immediately--while you are still completing the form!
Any time you or your users access a form, the Submit button will be disabled until valid data has been supplied in all required fields. The Submit button also will be disabled if you supply invalid data in a field that is not required.
When you are done testing and are ready to roll out your form, mark it public via the 
icon and make it available by sharing it. See below.
Forms can be translated to multiple languages using the internationalization feature which enables you to easily localize your forms for target audiences that vary in culture, region and language. The translation files you create and upload into are selected when testing and using forms via the Url parameter _locale. If this parameter is not set on the form Url or if it is empty then it defaults to the language you used when designing your form. In order to initialize the form with other languages, set _locale to the language string you want. See Multi Language Support for details on creating translations and testing locale translations for information on the _locale=<codes>.