First make sure to have the original package installed. More on how to install the original package here

Run the composer command to install the package:

composer require larabug/nova-larabug-tool

Register the tool inside the app/Providers/NovaServiceProvider.php file:

use Larabug\NovaLarabugTool\NovaLarabugTool;

...

public function tools()
{
    return [
        new NovaLarabugTool
    ];
}