The plug-ins in Jenkins are distributed from a central update site. Select the option Manage Jenkins in the left menu and look for the Manage Plugins option. Clicking on Available will bring you the list of plug-ins ready to be installed in your Jenkins installation.
Just check the check box besides the plug-in name on the list and click on Install to install the plug-in. Jenkins will download and install the plug-in automatically for you. Restart Jenkins to enable your plug-in.
After restarting Jenkins, go to Manage Jenkins again, this time click on Configure System option and look for the TestLink section. Fill the TestLink configuration form with a name for your TestLink installation, the URL of the XML-RPC API and your devKey.
By default the TestLink XML-RPC API URL is http://<host>:<port>/lib/api/xmlrpc.php. The devKey can be obtained by entering TestLink, clicking on My Settings (top menu) and generating a new devKey, if there is none yet. If you cannot see the API interface section in My Settings page, then it is very likely that you didn't enable it yet. Go back to Chapter 4, TestLink Configuration to review your work.