Can this be done please help!

So I have a little stereo amp for my desktop pictured below L&R speaker outputs and RCA Input. I just bought a passive sub and a mono amplifer for the subwoofer. On that amp there is an input and output and a +VCC. So I have two questions how do I wire this to my stereo amp to play the subwoofer and does this little chip need a power supply or to be plugged in?

How do I get this to work:? is my question lol

Full-board — ImgBB
STereo-Amp — ImgBB
Output — ImgBB
Input-VCC — ImgBB