Schedule an appointment. Ask your superior verbally or send a memo to request a brief meeting. Preferred meeting times are generally first thing in the morning or directly after lunch, before excessive deadlines and other obligations have a chance to pile up. The Meeting You should have a well-planned agenda for the meeting. Do not waste the boss' time by arriving disorganized.
Many employers are very helpful and non-intimidating when asked for raises.
Speak with respect, but not fear. Drop the attitude. Never present a request for a raise as a demand or threat. Instead assume a positive, friendly demeanor that conveys how much you enjoy your job. State the facts.