The first step is obviously to dump your girlfriend. Which makes the next step really, really hard, particularly if they are close friends. Tread carefully, my friend! It isn't a pretty path.
-Take it very slow! If you go to fast your gf's best friend might think that you only dated her best friend to get her, which may cause her to think your a player, or just not to like you. It also depends how close the two are. And, obviously, it depends if her best friend likes you or not!
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If you already have a girlfriend you shouldn't be trying to date someone else especially her best friend. if you want to be with someone else break up with the other girl first, but dating her friend would tear them apart and that would just be mean. Dont cheat on your girl unless you want to be a peace of trash loser the rest of your life.
you must make sure your best friend is ok with it or you will loose both of them