Yes, surely we can edit our articles after posting on MindStick. 

There's a time limit of 72 hours in which we can edit our content posted on articles section. Once you had posted your articles you can edit your articles uncountably but in that given period of time. 

Articles are categorized under the Developer Section. to post articles you need to go to the Developer Section after that take your cursor to the Contribute button a drop down menu

will again show the categories of Articles, Blog, News etc. Click on the article and there you're done, Paste your Tittle and go with the details. 

Read More: How to share any post/article at MindStick?