If you're looking to type Ichishkíin in a variety of dialects, check out the Keyman app on your computer, phone, or online to install or access a keyboard that lets you type out all of the letters in our alphabet!
Phone keyboard
Available on Android & iOS devices
Search "Keyman" in your App Store. Install, and when you're setting up the app, search for "Yakama" or "Umatilla" languages.