Installing a sub/amp to a stock stereo, newbie help
 

Hey guys, newbie here.

I bought a 06 Jeep Liberty, the previous owner had a sub/amp installed to a stock stereo. I'm very unfamiliar with stock stereos, I had pulled my sub and amp from my previous car but am unsure how to put it in. The jeep already has a remote and a plug which I am unfamiliar with but have a hunch that its part of the method used to install. How and what would I need to install my current amp/sub. Here are a couple pics of the plug in question

https://www.caraudioforumz.com/attac...ine=1360165176
https://www.caraudioforumz.com/attac...ine=1360165176
You can see the remote next to it.
https://www.caraudioforumz.com/attac...ine=1360165176

The Amp is an Infinity 310A Monoblock Car Amplifier, Power Amp and the sub is a Car Audio Subwoofer - Thunder7500 SuperWoofer | MTX Audio

Any help on how to proceed would be greatly appreciated