You can open this page by clicking the Side Menu->Admin->System and selecting the Job Sites section tab.

To setup the ApplicantExtra Jobsite functionality (for instance with Jobserve UK), you must first establish an account with Jobserve.
While creating account with different job sites, you will need to activate special settings or provide additional IDs because you are integrating them with the ApplicantExtra.
Once you have a username, password and any other info for your account, enter them in this form and click Save.