1. install the Flutter SDK (https://docs.flutter.dev/get-started/install)

2. run "flutter doctor" from the command line to verify your installation

3. ensure you have a supported IntelliJ development environment; either:

    * the latest stable version of IntelliJ, Community or Ultimate Edition (EAP versions are not always supported)

    * the latest stable version of Android Studio (note: Android Studio Canary versions are generally not supported)

4. open the plugin preferences

    Preferences > Plugins on macOS, File > Settings > Plugins on Linux, select "Browse repositories…"

    search for and install the 'Flutter' plugin

5. choose the option to restart IntelliJ

6. configure the Flutter SDK setting

    Preferences on macOS, File>Settings on Linux, select Languages & Frameworks > Flutter, and set the path to the root of your flutter repo