1.- de esta manera: 'modules' => [ 'gridview' => [ 'class' => '\kartik\grid\Module', ], 'redactor' => [ 'class' => '\yii\redactor\RedactorModule', 'uploadDir' => '@webroot/path/to/uploadfolder', 'uploadUrl' => '@web/path/to/uploadfolder', 'imageAllowExtensions'=>['jpg','png','gif'] ] ], 2.- O de esta otra manera: return [ 'id' => 'app-backend', 'basePath' => dirname(__DIR__), 'controllerNamespace' => 'backend\controllers', 'bootstrap' => ['log'], 'modules' => [ 'redactor' => 'yii\redactor\RedactorModule'], /* el redactor esta aqui */ 'components' => [ 'request' => [ 'csrfParam' => '_csrf-backend', ], 'user' => [ 'identityClass' => 'common\models\User', 'enableAutoLogin' => true, 'identityCookie' => ['name' => '_identity-backend', 'httpOnly' => true], 'authTimeout' => 60 * 10, // auth expire ], 'session' => [ // this is the name of the session cookie used for login on the backend 'name' => 'advanced-backend', 'cookieParams' => [/*'httponly' => true,*/'lifetime' => 60 * 10//3600 * 24 * 30 ], 'timeout' => 60 * 10,//3600 * 24 * 30, 'class' => 'yii\web\DbSession', ], 'log' => [ 'traceLevel' => YII_DEBUG ? 3 : 0, 'targets' => [ [ 'class' => 'yii\log\FileTarget', 'levels' => ['error', 'warning'], ], ], ], 'errorHandler' => [ 'errorAction' => 'site/error', ], /* 'urlManager' => [ 'enablePrettyUrl' => true, 'showScriptName' => false, 'rules' => [ ], ], */ 'site/captcha/<refresh:\d+>' => 'site/captcha', 'site/captcha/<v:\w+>' => 'site/captcha', ], 'params' => $params, ];