It doesn't hurt to run the system test to make sure you have everything working properly.
To do so, log into your account and click on system test at the bottom of the menu.
This screen shows you all of the required devices that are needed to use ZenMD as well as an option to test each device as well.
Click "test". The system will identify the device and check its status. If everything is ok, the device will turn green, if the is a problem the device will turn red.