Kenwood DNX6960 Install Questions

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I installed a Kenwood DNX6960 with an Alpine PDX-5. I put in new new components and a sub from Wicked CAS, but those are not relevant to the 2 issues I am having.

1. I am not getting any AM/FM stations. I figure I hooked up the antenna wrong, but I'm not sure what to do. The 6960 has a plug in adapter for the antenna input and no wires on the actual harness going into the head unit. I used the Scosche NAA2B Antenna Adapter. I connected the large black plug to the HU's antenna connector, but I don't know what to connect the blue wire from the Scosche adapter too, if anything?

2. The instructions in the Apline PDX-5 are not very clear as to how to bridge the amp. I am running the Front Left RCA to a Y cable and connecting it to channels 1 & 2 on the amp. The Front Right RCA does the same to channels 3 & 4. My confusion is how to wire the speaker runs from the amp. I have 4 channel outputs and only 2 speaker wire runs.

Thank you for any assistance.