In the list of surveys you see a start icon 
beside each survey name, under the Preview header.
If the selected survey has been created to be presented online you can click on the start icon to browse through the survey, and to see how it looks, that is, how the survey participant will see it in his web browser.
Remember that if you answer the questions in the survey your answers will be registered in statistics.
Also see Description of the list under Surveys menu and Basics about Analyse.