The document provides instructions for automatically summarizing a document in Microsoft Word. It explains that AutoSummarize identifies key points by analyzing sentence frequency and importance. To use AutoSummarize, the AutoSummary Tools button must first be added to the Quick Access Toolbar. Once added, the user selects the type of summary, the detail level, and clicks AutoSummarize. AutoSummarize then creates a summary by selecting the highest scoring sentences based on the set detail level.