Yes, you can. In order to implement this you can go to Edit app --> Configuration --> Other settings: RIght side you will be able to see the provision to enter a custom message.
Can I change the message that appears after the user makes a submission?
Where am I?
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Yes, you will be able to achieve that from the "Other Settings" option available in the Configuration window while editing the app. You will be able to add a custom message applying all the custom fields of the app in text or in the HTML format for a better outlook.
Help Guide Link: https://help.clappia.com/help/app-settings/11