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Hello, I'm sorry you received that information fro the sales person at Best Buy. She is mistaken- the "AV1 In" (not AVI) is simply labeling the 5 color coded RCA jacks for the component video input, and the screw simply supports the mainboard in the TV to the rear panel .
The TV has two audio outs (AV1 is not one of them), they are the Optical connection, and the HDMI ARC jack.
If you're looking to simply connect a BlueTooth audio transmitter to the set to pair with an external device like Headphones or a BT enabled speaker, then you will be using the Optical port on the TV, as well as a converter.
The converter connects to the "Digital Audio Out" port on the TV using an Optical cable, with the other end of the Optical cable plugging into the converter. On the converter you will then have an 1/8" stereo analog out and a pair of stereo RCA audio outs with which you can use either to connect to your BlueTooth transmitter.
The converter that is needed is at the link below, along with the optical cable needed (assuming you already have a BlueTooth audio transmitter- those are all you will need):
If however you do not already have a BT transmitter then that would also need to be purchased, and is at the link below:
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