Update readme

README.md

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 # Python/Flask Tutorial for Visual Studio Code
 
 * This sample contains the completed program from the tutorial, make sure to visit the link: [Using Flask in Visual Studio Code](https://code.visualstudio.com/docs/python/tutorial-flask). Intermediate steps are not included.
-* To run the app, first run use `set FLASK_APP=hello_app:app` (Windows cmd) or `FLASK_APP=hello_app:app` (macOS/Linux).
 * It also contains the Dockerfile and uwsgi.ini files necessary to build a container with a production server. The resulting image works both locally and when deployed to Azure App Service. See [Deploy Python using Docker containers](https://code.visualstudio.com/docs/python/tutorial-deploy-containers).
+* To run the app:
+  1. Run the command `cd hello_app`, which is the folder that contains the Flask app.
+  1. Run the command `set FLASK_APP=webapp` (Windows cmd) or `FLASK_APP=webapp` (macOS/Linux) to point to the app module.
+  1. Start the Flask server with `flask run`.
 
-## Navigation
+## The startup.py file
 
-The `startup.py` file, for its part, is specifically for deploying to Azure App Service on Linux without containers. Because the app code is in its own *module* in the `hello_app` folder (which has an `__init__.py`), trying to start the Gunicorn server within App Service on Linux produces an "Attempted relative import in non-package" error. The `startup.py` file, therefore, is just a shim to import the app object from the `hello_app` module, which then allows you to use startup:app in the Gunicorn command line (see `startup.txt`).
+In the root folder, the `startup.py` file is specifically for deploying to Azure App Service on Linux without using a containerized version of the app (that is, deploying the code directly, not as a container).
+
+Because the app code is in its own *module* in the `hello_app` folder (which has an `__init__.py`), trying to start the Gunicorn server within App Service on Linux produces an "Attempted relative import in non-package" error.
+
+The `startup.py` file, therefore, is a shim to import the app object from the `hello_app` module, which then allows you to use startup:app in the Gunicorn command line (see `startup.txt`).
 
 ## Contributing