Hey Thipyaporn, just simply head over to the settings in the form/landing page editor and click on settings>incentive email.

You can also refer to this article to get into details - The Incentive Email40
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Hey Thipyaporn, just simply head over to the settings in the form/landing page editor and click on settings>incentive email.
You can also refer to this article to get into details - The Incentive Email40