The given page of the Reinstall Container wizard is displayed only if you have selected the Reinstall Container option for a running Container. Inasmuch as there is no possibility to reinstall running Containers, on this page you can stop the Container before proceeding to the reinstallation proper.
Press Next to stop the Container you are going to reinstall. This will take you to the page where you can view the reinstallation options and select the appropriate ones.