1. Go to this page and download the library: Download arifinm/yii2-ckeditor5 library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
arifinm / yii2-ckeditor5 example snippets
use \arifinm\ckeditor5\EditorClassic;
...
$form->field($model, 'fieldName')->widget(EditorClassic::className(), []);