If you want to login Merrill lynch online service, you need to visit this webpage. There you will get a login area, where you need to input your login detail (User ID & Passcode). If you are not a reggister client of MyMerrill, you need to Enroll (Register) yourself with your personal detail. Then you will be able to avail the online service.
Merrill Lynch is the wealth management division of Bank of America. This organization provides financial advice to their clients. MyMerrill is the free service that allows US based client of this organization to their account information (Client's) 24 hours a day. MyMerrill service also provide account holdings, trade confirmations, and monthly and year-end account statements.
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