To enroll in a Medicare prescription drug plan (Part D), you can follow these steps: 1. Go to the Medicare website (www.medicare.gov) or call 1-800-MEDICARE (1-800-633-4227) to find out which plans are available in your area. 2. Compare plans based on cost, coverage, and prescription drugs you take. 3. Enroll in a plan during the Annual Enrollment Period (October 15 - December 7) or during a Special Enrollment Period if you have a qualifying life event. 4. Provide your Medicare number and other required information to the plan. Once enrolled, your prescription drug coverage will begin on the first day of the month in which you enrolled.