I assume that the message “Successful message” refers to the message shown next to the buttons located at the bottom of the form.
This message is displayed when the success-message()action starts . Actions are performed by processes that at the time of this writing cannot be defined in Form Builder, but instead defined in yours properties-local.xml. If you are new to this, I would recommend that you familiarize yourself with the Buttons and processes in the documentation.
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