Hi Fiona,
A quick look at the file you had attached indicates that you did not close the <form method="post"> command with </form>
In your file, you might try adding </form> on the line above </body> near the bottom of your file. All entered responses should get saved as data.
Page 84 of the MediaLab v2012 manual “What is an HTML form?” gives examples about how to use the form command, and suggests a useful HTML website for more advanced uses of the command: www.w3schools.com/html/html_forms.asp