The Rod SmartLav uses a TRRS connector on it, and the Macbook Pro uses the TRS (I believe). You need an adapter to make it work properly.
Honestly, you are going to get some sound quality degradation using the SmartLav with a Macbook Pro, and would be better off getting a USB microphone to work with the laptop like a Rode Podcaster or NT model.
The other option would be to get an older iphone or ipad to use for recording. We used to use an old iPad with the SmartLav and treated it as our audio recorder, which worked well, until we upgraded to a more powerful and professional setup.
*Brains behind Jason Dion*