Steps. 1  1. Collect change from around your home and car. 2  2. Clean the change if it is dirty at all. 3  3. Visit the CoinStar website at CoinStar.com to find out more about how to use CoinStar to donate to charity with helpful videos and instructions.  4. Enter your city or zip code in the top right corner of the CoinStar site to find the nearest machine.