The document provides instructions for setting up the Marathi language input on a Windows XP operating system by accessing the Regional and Language Options in the Control Panel, selecting Marathi as an input language, and applying the Marathi settings which will display the Mangal font for typing in Marathi. It also explains how to switch between the Marathi and English input languages using the Alt + Shift keys and left arrow. The document recommends using the Inscript keyboard for easy typing in Marathi.