add screenshot for data service GPTs

tidb-cloud/data-service-manage-data-app.md

@@ -70,13 +70,15 @@ To integrate your Data App with GPTs, perform the following steps:
 1. Navigate to the [**Data Service**](https://tidbcloud.com/console/data-service) page of your project.
 2. In the left pane, locate your target Data App and click the name of your target Data App to view its details.
 3. In the **Integration with GPTs** area, click **Get Configuration**.
+![Get Configuration](./img/data-service/GPTs1.png)
 4. In the displayed dialog box, you can see the following fields:
 
-    - **API Specification URL**: copy the URL of the OpenAPI Specification of your Data App. For more information, see [Use the OpenAPI Specification](#use-the-openapi-specification).
-    - **API Key**: enter the API key of your Data App. If you do not have an API key yet, click **Create API Key** to create one. For more information, see [Create an API key](/tidb-cloud/data-service-api-key.md#create-an-api-key).
-    - **API Key Encoded**: copy the base64 encoded string equivalent to the API key you have provided.
+    a. **API Specification URL**: copy the URL of the OpenAPI Specification of your Data App. For more information, see [Use the OpenAPI Specification](#use-the-openapi-specification).
+    b. **API Key**: enter the API key of your Data App. If you do not have an API key yet, click **Create API Key** to create one. For more information, see [Create an API key](/tidb-cloud/data-service-api-key.md#create-an-api-key).
+    c. **API Key Encoded**: copy the base64 encoded string equivalent to the API key you have provided.
+    ![GPTs Dialog Box](./img/data-service/GPTs2.png)
 
-5. Use the copied API Specification URL and the encoded API key in your GPT configuration.
+6. Use the copied API Specification URL and the encoded API key in your GPT configuration.
 
 ### Manage linked data sources
 
@@ -188,4 +190,4 @@ To delete a Data App, perform the following steps:
 
 ## Learn more
 
-- [Run Data App in Postman](/tidb-cloud/data-service-postman-integration.md)
+- [Run Data App in Postman](/tidb-cloud/data-service-postman-integration.md)