Hello.
I assume your Durabrand has only RCA inputs (white/red) for it's AUX input? If yes, then you will need an Coxial to RCA converter:
Toslink to RCA converter
Connect a single cable from the Coxial Out (orange rca jack) in the rear of your tv into this converter, and connect your durabrand home theater using white/red rca cables to this converter. These converters can be found online, and sometimes in a local electronics store.