If your My Cloud has the same Workgroup name then I suggest you unplug your router at the router for about one minute and then plug it back in, give everything time to start back up and then check to see if it shows in SmartWare.
To get SmartWare Pro (Free) click on the gold calendar and follow the instructions. You will get an email sent to the address you registered your My Cloud with giving you the Activation Code. Be sure to save the email.
Do you have Network Discovery on? If not turn it on and see what happens. If you do then the next thing I would recommend is that you shut down all your devices and restart them at the same time to see if that will get them all to recognize each other.