I listed a link to the PDF manual, above.
Give it a read.
Also, since you have the unit, give it a look.
If there's no rear (RCA jack) connector marked "coaxial audio" nor a little black optical jack, then ya don't have one
On the other hand, it's not uncommon for sellers to make a mistake.
Such features as AC3 are quite common, so it's easy to assume.
I wouldn't ream them a new one.
A bunch of us got FTA receivers a few months ago from a very knowledgable vendor.
They were supposed to have blind scan.
They didn't.
Other sellers listed blind scan in their advertizing for the same receiver, too.
Crap happens.