You're right that no one is going to come up to you with a big red button that you can press. The actual changes that would help are probably more subtle than

You're right that no one is going to come up to you with a big red button that you can press. The actual changes that would help are probably more subtle than that (assuming that your workplace is somewhat reasonable -- aka not the scenario discussed in this post). Make sure you don't talk over people or otherwise belittle their contributions. If you see someone else doing that, you can say something like, "hold on, I wanted to hear what A said", or "yeah, isn't that what B just suggested we do?". Etc.