How do I change the email address that webform results are sent to?

Go to the content overview page and filter by "type" "webform". Click "edit" for the form that you will be changing the email address for. 

Click the "Webform" tab at the top of the page, then click "e-mails" directly beneath that tab. To edit/change the email address that the form is currently being sent to, click "edit" to the right of the email listing and then make the change and submit the form. To add another email to send the webform results to, click "Add" and then add the details and submit the form.