Hi Prashoop,
Images can upload in a article very easily .Here i include some simple steps that can use very effectively.first you prepare your article ,if you like to add image on a particular article ,then you select the optioni want to add some attachments to this resources,then publish the article.then you can manage the attachments,from there you can upload image by choosing a file then submit attachment.Then you can find uploaded image and it's download link ,small image link and normal image link.From there you can copy the link of uploaded image,then edit your article and paste your image link,where you want to see image.Also you can align image left,right and center by editing html tags.
Hope you can understand image uploading in a article.
with regards
Ajmal