This is a Yii2 porting of amazing Yeti extension http://www.yiiframework.com/extension/wizard-behavior/ Please refer to link above for manual. This is an early version.
The preferred way to install this extension is through composer.
Either run
php composer.phar require --prefer-dist makroxyz/yii2-wizard "*"
or add
"makroxyz/yii2-wizard": "*"
to the require section of your composer.json file.