I have two things to pass down to you from personal experience: 1) it helps if you get the child around other children who ride bikes, even if they are slightly older than he/she. 2) get a bike yourself and ride in front of the child or just play like your gonna ride his/her bike. Most of the time either one of those two will work, unless the kid is traumitized from a past experience! i hope i helped:)
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Get the kid a run bike, one of those that don't have any pedals. Encourage the kid torun along while straddling the bike. Once the kid is showing the ability to pick his/her feet up and coast for a few yards they are ready for a pedal bike and will usually make the transition real easy.
Do note that even if a kid can learn to ride at quite a young age, they will nowhere near be mature enough to ride in traffic. Someone that young should only be allowed to ride well away from traffic, and under adult supervision.
Pretty much the same way most kids are taught. Get them on the bike, have them pedal forward while running alongside helping them balance.