Once the integration is successful, find the Impact sources section in the sidebar and click the + Add link nested under that section.
Select Jenkins from the dropdown and continue by clicking Enable and add.
Give this build tracking instance a name and select which build or job inside a build should be used to base the impact measurements on.
That's it! Sleuth will now start verifying your deploys health by tracking whether the selected build/job is passing or failing. Head over to the Dashboard to start seeing your data in action in the project and deploy health graphs.