There were questions about using Zelle to donate. You have to have a US Bank account and be able to login and register your bank with Zelle.
You can find your bank mobile app here: https://www.zellepay.com/get-started
If you already have the bank app on your phone just login and register your phone or email with Zelle to transfer money.
Another way to register Zelle on your phone is to download the app onto your phone: https://www.zellepay.com/go/zelle