How do I connect buds2 to a Bluetooth transmitter?

I bought This for my new 3ds xl and I wanted to use to make my 3ds Bluetooth compatible, I got my buds into pairing mode in the case, flashing red and green, then I don't know what to do from there. how do i get them to pair with the transmitter?

EDIT: okay I figured it out, you get both into pairing, then you tap the earbuds and it'll pair, it's weird but it works