added postman images

02 Lab 2 TDD API.md

@@ -28,9 +28,13 @@ Install the [Postman](https://www.getpostman.com) software and launch. Now start
 
 ### Adding Items
 
-To add items to a collection we need to use the **POST** method, specifying the data in the request body. In postman, select the **POST** method from the dropdown list and enter the collection URL to the right of this as shown below. In the request **Body** tab enter the required data as a JSON string. In the **Headers** tab create a new header called `Content-Type` with a value of `application/json` to let the API know your data is in the JSON format. If you click on the **Send** button your request will be sent to the API and you should see some data in the _response body_ tab as shown below.
+To add items to a collection we need to use the **POST** method, specifying the data in the request body. In postman, select the **POST** method from the dropdown list and enter the collection URL to the right of this as shown below. In the **Headers** tab create a new header called `Content-Type` with a value of `application/json` to let the API know your data is in the JSON format.
 
-![the Postman tool](images/postman_post.png)
+![the Postman tool](exercises/.images/postman_headers.png)
+
+In the request **Body** tab enter the required data as a JSON string.  If you click on the **Send** button your request will be sent to the API and you should see some data in the _response body_ tab as shown below. Finally click on the blue **Send** button to send the HTTP request to the API.
+
+![the Postman tool](exercises/.images/postman_body.png)
 
 You have added a new resource to the **items** collection. Try adding a few other items.