I am assuming that you have a Seiki TV. Take a look at the owners manual where it shows the back of the TV with all of the input and output connections. Locate where it says Optical output. This is where you need to plug in the optical cable that you got with the soundbar. One end gets plugged into the TV and the other is plugged into the soundbar. There are no settings on the TV that need to be changed. Once you have the optical cord plugged into the TV it will recognize that you have an optical connection. Make sure that you have selected "OPT" on the soundbar and make sure you have the volume turned up on the soundbar and it should work.
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