Help! How to bridge an amp channels

[Metal Overload]

I´ve just got a mosvalve poweramp, it is stereo , but i only use mono.
Each channel is rated on 80 watts, but it seems that you can bridge the channels and get 160 watts in mono operation, so i want to know how to do this , because i need more juice from this amp.

Could someone help me on this??
Thanks!!

 

[Mr. Brokenamp]

If there is no mono switch just use a Y cable

 

[Metal Overload]

Y cable, on the speakers out??

in the input section, the channel A is marked (Mono input bridged) or something like that, i suppose with only conecting in this input, the amp set on mono, but i did that, and i feel that is lack of power, im running it with a 8 ohms cab, but is lack of volume, and i know that this amp is louder.
I want to use the 160 watts that is suppose to throw.

Thanks for your answer dude