How Do FMO's Get Paid if I'm Independent?

Hi guys...I have been considering getting my contracts thru a FMO named Kellog Insurance Marketing. I have heard good things about them and they are local and say they offer top contracts, with competitive carriers, and that they only work with independent agents. That my business is my own. The reason I am considering them as my FMO is because they have 47 years in the senior market and they have hands on training on a local level and I think that this will help my get a handle on things a lot quicker than if I was on my own.

I am just a little confused about how this works. They say

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