If the blue led is blinking than the device is not being recognized by the computer. When it is it will stop blinking and stay lit. So first thing to check is that you properly installed the driver and that with Mac you also have to authorize the driver (new Mac procedure for third party programs) within 30 minutes of installing it. Otherwise it times out and you will have to uninstall and reinstall. Once you get the blue led to lock on then the Universal Control app should connect.