In order to enable Test Mode, select the Site Manager in the upper right hand corner of the user interface.
Important note: You will not be able to view the choices in these directions if your Site is already in Test Mode. To put this another way, you cannot edit your Site and switch to Live Mode from Test Mode via this method.
Select the Site you wish to convert to Test Mode, and select Edit Current Site.
Scroll down to Test Mode and select Yes. Select Save Changes to commit this change. You Site will immediately be converted to Test Mode.
Verify that your site is in Test Mode by ensuring that the green dot is not ON next to the Go Live status bubble.
For full documentation on testing, please see our documentation here.