First when you submit your article click on add attachments box which is just above submit. Then you have to upload the neede picture by browsing it and submit it also. Now you will see 'embed image in article' just below your image. Click it and you will proceed to the edit page of your article. At the lower bottom of its body you will see the image code. Cut and paste it to where ever you need. Inside the bracket (just like this <>) and also to its end you can write as align='right'/'left'. Then submit your article.
Hope it is helpful.