You will need to connect the coaxial cable (You can use 1 cable of the supplied RCA lead) into the back of your BASE Sound System and the other end into the coaxial output on the rear of your TV.
Then select the coaxial button on your remote control. The LED indicator on your BASE Sound System should now be yellow.
You may need to enable the coaxial feature on your TV. Please consult your TV's user guide. It is recommended to use the PCM option if available.