Go to the survey section, 

Click on the Create New Survey option and choose Use survey template:

This will start the Survey Wizard.

Click on the My Survey Templates tab and select the survey that you want to use.

Then you will move to the next step in the wizard. This will open the Create Survey Window with the survey loaded and ready to edit.

For more information about how to use the Create Survey Window and save a survey as a template, see the support topic How Can I Create a New Survey.