Unable to protest and want to know how you can help Black Lives Matter make a difference this time? Check their website first. Right now they’d like you to sign their Defund the Police petition.
Then write to or call your local officials and ask them whether they support these steps toward reducing police violence:

If they don’t know what you’re talking about, it’s a good time to educate. If they tell you they don’t support these commonsense measures, tell them you’ll find a candidate who does come voting day.
And speaking of voting day. When the protests end, it’s important to keep the momentum going. It’s an election year and the GOP has been systematically disenfranchising black voters for years. Learn how you can help make sure every black vote is counted.
Silence is violence, they say, and they’re right. And no matter your particular limitations, there’s always something you can do. What matters most is that you do something. (Learn more about allyship here.)