Jenkins for DC/OS can be uninstalled using either the web interface or the CLI.
The process does not delete the data stored on either the pinned agent or the shared file system. You must delete this data manually.
Hover over the Jenkins instance that you wish to uninstall. A red Uninstall link will appear on the far right.
From the CLI, you can uninstall with the following command.
dcos package uninstall jenkins