I read your article and let me tell you, you are are a very good writer.
I have approved your article. I hope you must have read new members' frequently asked questions. If not, please read it.
Now as far as article writing is concerned, if you want to edit any of your article or change the category in which it is posted, there is option of edit in the top, which you can use to edit your article. Since you have same article twice, I had to delete on article. However I would suggest you that, if in future you want to write another article, you can open that deleted article in edit mode and edit everything (i.e topic, summary, category, entire article). This will make your profile look good with no deleted article against your name.
Coming to my third point, I would like to provide you some tips on search Engine optimizations(SEO). For that that I would send you a chat request, so that I can guide you and you can clear any of your doubts online.