It seems to me you haven't properly installed the TC. You need to do that first before you can use TM. Once you plug in the TC, the light will flash amber and you will need AirPort Utility (in Applications-->Utilities folder) to configure your TC just making sure you have the latest version of AirPort Utility. You can update it through the included CD or download it. You just follow the instructions and configure your TC to the appropriate network settings. Once that is done, TC will restart and the light will stay green meaning it is working. You should see TC in the SHARED section of your Finder. Good luck.