You should lead with that next time - Mac is a different animal. The drivers for the USB chip used by the Ruida often conflict with the drivers that ship with MacOS, so you have to remove one of them.
You can set up with Ethernet to bypass the issue: How do I connect a Ruida controller with Ethernet?
Or you can follow here to solve the driver issue: https://superuser.com/questions/1135730/how-to-release-reset-serial-port-ftdi-devices-mac-osx