Yes I've read the wiki and several guides and webpages and watched videos, I understand FTL is Focusless, Leaderless, Targetless Setup.
But I still don't understand it, I don't understand what the modifier keys are, how it works, I'm so confused.

Can someone explain it to me using just 2 characters for example instead of the normal 5.

So how would one go about using a 2 man FTL setup.