If you want to apply for any job advertise by KPPSC (Khyber Pakhtunkhwa Public Service Commission), you need to apply online through KPPSC Website. You need to know case no. of the job for which you are applying.
Here is the link to apply for the KPPSC jobs online:
http://www.kppsc.gov.pk/online/index.php
How to Apply Online for Jobs at KPPSC,