Aftermarket radio in 2014 Dodge Avenger

As the title states, I'm trying to install an aftermarket radio to get me by since the factory radio, also in the pictures, gave out on me. I know the white wire is the antenna and I'll have to buy an attena adapter but what does the yellow capped wire do or where does it go? What exactly do I need to complete the install? The cheap aftermarket radio I went with is a Boss stereo 820BRGB.