To edit a survey go to:
On the Surveys tab, click on the survey name you wish to edit. If you are logging in for the first time. You will only see the Create a New Survey button. You can start by creating a new survey.
The survey name you clicked on will be selected. You will be taken to the Edit Survey tab. Here, you can edit the survey.
Active/Selected survey name is always displayed near the top right corner along with the preview link.