Enrollment in Medicare is usually automated up on person reaching age or qualifying status. If for some reason individual does not receive Medicare Card or automatic enrollment does not occur, you can apply for it in your local Social Security Office. This link will help you find local Social Security Office https://secure.ssa.gov/ICON/main.jsp. Also, CMS site has a lots of useful information regarding Medicare, here is link http://www.cms.gov/Medicare/Medicare.html.
I hope this helps.
I hope this helps.