Yamaha RXV2700 with sub

Hello, I've got a yamaha rxv2700 amplifier, which apparently has 140w on each of its 7 channels, I think.
I have a Lanzar max pro 8" 4ohm subwoofer, with around 800w peak and 400w rms.
I'm pretty amateur, how could I run the woofer of the amplifier? I assume I have to bridge some channels to reach the 400w, but I'm not really sure.
I have a crossover for the subwoofer already, just need some help wiring it, thanks!
Back of yamaha rxv2700:

Note: I know that it's supposed to be used as a home theatre amplifier, but I don't have anything else around at the moment, would be cool to get it working.
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