Beginner Question for IR Remote

I’m trying to figure out how to physically attach the IR remote to my Teensy 3.6 with a Smartmatrix shield. I see a lot of posts for the libraries, however I have no idea how to attach an IR module to the teensy. I have only found posts for a Teensy 3.1, but nothing for newer models. If anyone can assist me with finding where to purchase the items necessary and a guide on where to start, it would be much appreciated.

This is better asked on a teensy forum since there is nothing smartmatrix specific in your post.
But basically you can use any free IO pin and tell your IR library to use that pin.
Normally you’d connect ground to ground, Vcc to the 3.3V pin, not 5V, and then signal pin to any free IO pin.