You can schedule apex class from Setup-> Apex Class -> Schedule Apex Button

You need to check following options for Manage link visibility on Scheulde jobs.

• To monitor scheduled jobs user needs “View Setup and Configuration”
• One more thing, is some one scheduled those job using Developer Console, Workbench. Hence Manage Link will not be available.

You can schedule apex class from Setup-> Apex Class -> Schedule Apex Button

You can schedule apex class from Setup-> Apex Class -> Schedule Apex Button

You can schedule apex class from Setup-> Apex Class -> Schedule Apex Button