Plugin Installation
The plugin is available on the Plugin Repository, so you can install just by searching it and clicking the install button.
If for some reason you do not want to install the latest version of the plugin, or you want to install a pre-release, you can also install it by specifying a .zip archive to the plugin manager. The available versions are located here.
Once the plugin is installed and OctoPrint has been restarted, you will be granted with the configuration wizard. You need to have arduino-cli and/or PlatformIO-Core installed to fill it.