Step 1. Click on the Menu Bar option on the top right of the screen. 

Step 2. Click on the Library Module under the Menu Bar.

Step 3. Click on Return Book from the left sidebar of the screen. 

Step 4. Enter the book number or the barcode of the book you want to return. And then, click on Search option next to the blank field. 

Step 5. Lastly click on Return Book at the bottom right of the screen.