Default Proper/default APN MMS settings

Hey everyone

Seems like the classic story, but i've been struggling with MMS since day 1. I recently downloaded evolve sms, and they have a preset verizon APN setting that works, which i'm grateful for.

But i'm trying to understand what the hell these settings are supposed to be...why can't i send mms through any other app? when i ask evolve sms to fetch the APN settings automatically it says it can't, which i assume is what's going on in other apps. and when i go into APN setting i see a long list of a bunch of different options, and default none of those was even selected....

anyway. Does anyone know how this works? or how to set the APN settings to get MMS working through hangouts?