That trips most people up, but it goes right back to our first discussion about cars also being "not real". If I say to a coworker, "I got in my car and drove to work", and they reply with, "Well that's impossible, because cars don't exist, nor do day jobs", that's kind of nonsense right, because there I am at work, standing in front of my coworker with my car in my parking spot. It's a category error, and it's the same error made when people say that a choice wasn't really ours because it's dictated by the movements of particles.
The fact that thoughts, feelings and beliefs may be caused by deterministic underlying physics is actually irrelevant, which is why Compatibilism is compatible with determinism. What matters is that thoughts, feelings and beliefs counterfactually dictate your choices, and so, by changing thoughts, feelings and beliefs via moral feedback, you change behaviour.
Moral blame is that feedback. The type of control that's needed is simply not the type of control that you're assuming it must be. This is the mistake incompatibilists make as well: they assume the type of control needed has certain logical properties, but these properties have been shown to be flawed.
Now what consequences follow from blame is a completely separate question (of justice), and I mention this because it trips a lot of people up: they assume blame entails punishment, and given they cannot justify punishment when some things are simply beyond one's control, they want to do away with blame itself. But that's unnecessary, because blame by itself doesn't immediately entail retributive justice with punishment, there are plenty of other forms of justice that would serve equally well.