Change of input on DAC+ DSP

A beginner question because I just ordered my first board (DAC+ DSP), but I can't find any answers in the guides.
The plan is to connect my TV in the toslink input. 
How do I change which input the DAC+ is using? If it's getting a signal from the TV and the RPi at the same time, what's the signal that's actually going to the RCA connectors, and how do I switch to another one?
Is this supported in some software, and not in others? And if so - which is which? 
Thank you in advance. :)

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