Discover Siri Shortcuts
First, check to make sure you've installed and set up the Shortcuts app for iOS (this is an official app from Apple). After that, click on the "Setup Teslascope" shortcut below and go through the setup process.
You will need an API Key generated, and the public ID of the vehicle you wish to interact with. This can be found in the vehicle's URL (typically 3-4 characters), or under vehicle settings.