- Explain enough about the literary criticism theory to show the reader that you really understand the theory.
- Explain enough about the short story to show the reader that you really understand the story.
- Apply the theory to the story, using some of the language of the theory.
You can take whatever point of view you wish. Your goal is to demonstrate that you understand both theory and story and can work with both of them/link them together. Your "argument" is that your perspective is an appropriate perspective to take with that particular text.
Remember that you may revise your work as often as time allows. You can do it! You can be successful!