Introducing how does Boost work on Cash App . With Boost, you can quickly save money when using your cash card at coffee shops, restaurants, and other commercial establishments. To start, all you need is a Cash Card. If you already have a Cash Card, follow these steps to start saving: Touch the Money Card tab on your home screen Press Save with Boost. Touch a Boost. Touch, Add Boost. Start saving. You can visit our website for more detailed info.