Make sure the following are installed on the Jenkins host (if you do work with Jenkins slaves and you want to continue like that, you'll also need to do this on each slave as well as the master):
Docker (strictly speaking, you just need the binaries, the daemon does not have to be running).
Install the CloudShare Docker-Machine driver in the Jenkins' PATH.
Install the CloudShare Docker-Machine plug-in through the Jenkins Plugin Manager.
Enter your CloudShare API key and API ID in the global configuration page ("Configure System"). You can obtain your CloudShare API credentials on your user details page.