How to add a link to your survey's "Thank You" screen
To add a link to the "thank you" screen of your survey, go to "Survey Management" and open the survey you wish to edit.
Click the "end of survey" section of the survey editor.
Click "link" button on the left.
From there you can add a link to your survey and customize the url/display text.
After editing the "thank you" screen, remember to save your survey.