Update azure-portal.md

Author: derekolo

articles/peering-service/azure-portal.md

@@ -89,6 +89,9 @@ From a browser, go to the Azure portal and sign in with your Azure account.
 
 1. When you see the **Validation passed** message as shown, select **Create**.
 
+ > ![Register Peering Service configuration tab](./media/peering-service-portal/peering-service-prefix.png)
+
+
 1. After you register a Peering Service connection, additional validation is performed on the included prefixes. You can review the validation status under the **Prefixes** section of the resource name. If the validation fails, one of the following error messages is displayed:
 
    - Invalid Peering Service prefix, the prefix should be valid format, only Ipv4 prefix is supported.