You can change your survey thank you text (or success message) that shows when a survey is completed to suit your brand.
By default, the survey complete text will show 'Thank you for completing the survey'
To change your survey thank you message:
Navigate to your Survey editor>Builder, and the survey panel on the right side of your screen
Under the heading Survey Complete, you'll find Survey Complete Page Markup
Edit the text and click Save changes
This field supports HTML. If you are not familiar with markup, we suggest editing the text between the <h3></h3>, but don't removing this.