How to reset Engine Warning (Malfunction Indicator) Light?

Recently, the Engine Warning (Malfunction Indicator) Light started switching intermittently on my Nissan Micra and the car lost its power. Plus there was a lot of smell in the exhaust. I was in a garage for a paid computer testing and was told that ignition coil broke down. I replaced it myself. Now the Engine Warning light is solid. How can I switch off the light? Do I need to reset Micra's computer settings? If so, should I buy software from internet and use it (I saw it for about £20 on ebay from China including cables and sockets for Micra) or there much easier solution? Thanks.
 
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