Step 1 : When you click on Academic Sessions Sub-module under Academic Settings Module, below window will be shown on  your screen. Here you can manage Academic Sessions.

Step 2 : On the top right hand corner, New Academic Session button is available which can be used for adding new Academic session.

Step 3 : And when you click on New Academic session below window will popup on your screen. Here you can add new academic session.

Step 4 : After Saving the new Academic session, a list will be shown where you can Active/ Deactive & Modify. All action button will show in the list.