99.5 Pathfinder SE Auto Keyless Entry disengaged

Hi People,
I just bought a used 99.5 Pathfinder SE. The keyless entry is not working. The dealer said it is disengaged from the bottom of the truck. The remote seems to function fine as when I press any key, the red light comes on. I can take it to a car audio place where they will rip me off to (hopefully) fix a small thing. Any one aware how to do this or has any experience with this. Im not sure, it has a remote starter or not but there is a small thing behind the rear view mirror on the windshield with two small pokes on both sides. Its like this:
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Thanks for reading!:)